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This page provides a high-level summary of changes to SQLite. For more detail, refer the the checkin logs generated by CVS at http://www.sqlite.org/cvstrac/timeline.

### 2008 Nov 19 (3.6.6)

- Fix a #define that prevented memsys5 from compiling
- Fix a problem in the virtual table commit mechanism that was causing a crash in FTS3. Ticket #3497.
- Add the application-defined page cache
- Added built-in support for VxWorks

### 2008 Nov 12 (3.6.5)

- Add the MEMORY option to the journal_mode pragma.
- Added the sqlite3_db_mutex() interface.
- Added the SQLITE_OMIT_TRUNCATE_OPTIMIZATION compile-time option.
- Fixed the truncate optimization so that sqlite3_changes() and sqlite3_total_changes() interfaces and the count_changes pragma return the correct values.
- Added the sqlite3_extended_errcode() interface.
- The COMMIT command now succeeds even if there are pending queries. It returns SQLITE_BUSY if there are pending incremental BLOB I/O requests.
- The error code is changed to SQLITE_BUSY (instead of SQLITE_ERROR) when an attempt is made to ROLLBACK while one or more queries are still pending.
- Drop all support for the experimental memory allocators memsys4 and memsys6.
- Added the SQLITE_ZERO_MALLOC compile-time option.

### 2008 Oct 15 (3.6.4)

- Add option support for LIMIT and ORDER BY clauses on DELETE and UPDATE statements. Only works if SQLite is compiled with SQLITE_ENABLE_UPDATE_DELETE_LIMIT.
- Added the sqlite3_stmt_status() interface for performance monitoring.
- Add the INDEXED BY clause.
- The LOCKING_STYLE extension is now enabled by default on Mac OS X
- Added the TRUNCATE option to PRAGMA journal_mode
- Performance enhancements to tree balancing logic in the B-Tree layer.
- Added the source code and documentation for the genfkey program for automatically generating triggers to enforce foreign key constraints.
- Added the SQLITE_OMIT_TRUNCATE_OPTIMIZATION compile-time option.
- The SQL language documentation is converted to use syntax diagrams instead of BNF.
- Other minor bug fixes

### 2008 Sep 22 (3.6.3)

- Fix for a bug in the SELECT DISTINCT logic that was introduced by the prior version.
- Other minor bug fixes

### 2008 Aug 30 (3.6.2)

- Split the pager subsystem into separate pager and pcache subsystems.
- Factor out indentifier resolution procedures into separate files.
- Bug fixes

### 2008 Aug 6 (3.6.1)

- Added the lookaside memory allocator for a speed improvement in excess of 15% on some workloads. (Your mileage may vary.)
- Added the SQLITE_CONFIG_LOOKASIDE verb to sqlite3_config() to control the default lookaside configuration.
- Added verbs SQLITE_STATUS_PAGECACHE_SIZE and SQLITE_STATUS_SCRATCH_SIZE to the sqlite3_status() interface.
- Modified SQLITE_CONFIG_PAGECACHE and SQLITE_CONFIG_SCRATCH to remove the "+4" magic number in the buffer size computation.
- Added the sqlite3_db_config() and sqlite3_db_status() interfaces for controlling and monitoring the lookaside allocator separately on each database connection.
- Numerious other performance enhancements
- Miscellaneous minor bug fixes

### 2008 July 16 (3.6.0 beta)

- Modifications to the virtual file system interface to support a wider range of embedded systems. See 35to36.html for additional information. *** Potentially incompatible change ***
- All C-preprocessor macros used to control compile-time options now begin with the prefix "SQLITE_". This may require changes to applications that compile SQLite using their own makefiles and with custom compile-time options, hence we mark this as a *** Potentially incompatible change ***
- The SQLITE_MUTEX_APPDEF compile-time option is no longer supported. Alternative mutex implementations can now be added at run-time using the sqlite3_config() interface with the SQLITE_CONFIG_MUTEX verb. *** Potentially incompatible change ***
- The handling of IN and NOT IN operators that contain a NULL on their right-hand side expression is brought into compliance with the SQL standard and with other SQL database engines. This is a bug fix, but as it has the potential to break legacy applications that depend on the older buggy behavior, we mark that as a *** Potentially incompatible change ***
- The result column names generated for compound subqueries have been simplified to show only the name of the column of the original table and omit the table name. This makes SQLite operate more like other SQL database engines.
- Added the sqlite3_config() interface for doing run-time configuration of the entire SQLite library.
- Added the sqlite3_status() interface used for querying run-time status information about the overall SQLite library and its subsystems.
- Added the sqlite3_initialize() and sqlite3_shutdown() interfaces.
- The SQLITE_OPEN_NOMUTEX option was added to sqlite3_open_v2().
- Added the PRAGMA page_count command.
- Added the sqlite3_next_stmt() interface.
- Added a new R*Tree virtual table

### 2008 May 14 (3.5.9)

- Added experimental support for the journal_mode PRAGMA and persistent journal.
- Journal mode PERSIST is the default behavior in exclusive locking mode.
- Fix a performance regression on LEFT JOIN (see ticket #3015) that was mistakenly introduced in version 3.5.8.
- Performance enhancement: Reengineer the internal routines used to interpret and render variable-length integers.
- Fix a buffer-overrun problem in sqlite3_mprintf() which occurs when a string without a zero-terminator is passed to "%.*s".
- Always convert IEEE floating point NaN values into NULL during processing. (Ticket #3060)
- Make sure that when a connection blocks on a RESERVED lock that it is able to continue after the lock is released. (Ticket #3093)
- The "configure" scripts should now automatically configure Unix systems for large file support. Improved error messages for when large files are encountered and large file support is disabled.
- Avoid cache pages leaks following disk-full or I/O errors
- And, many more minor bug fixes and performance enhancements....

### 2008 Apr 16 (3.5.8)

- Expose SQLite's internal pseudo-random number generator (PRNG) via the sqlite3_randomness() interface
- New interface sqlite3_context_db_handle() that returns the database connection handle that has invoked an application-defined SQL function.
- New interface sqlite3_limit() allows size and length limits to be set on a per-connection basis and at run-time.
- Improved crash-robustness: write the database page size into the rollback journal header.
- Allow the VACUUM command to change the page size of a database file.
- The xAccess() method of the VFS is allowed to return -1 to signal a memory allocation error.
- Performance improvement: The OP_IdxDelete opcode uses unpacked records, obviating the need for one OP_MakeRecord opcode call for each index record deleted.
- Performance improvement: Constant subexpressions are factored out of loops.
- Performance improvement: Results of OP_Column are reused rather than issuing multiple OP_Column opcodes.
- Fix a bug in the RTRIM collating sequence.
- Fix a bug in the SQLITE_SECURE_DELETE option that was causing Firefox crashes. Make arrangements to always test SQLITE_SECURE_DELETE prior to each release.
- Other miscellaneous performance enhancements.
- Other miscellaneous minor bug fixes.

### 2008 Mar 17 (3.5.7)

- Fix a bug (ticket #2927) in the register allocation for compound selects - introduced by the new VM code in version 3.5.5.
- ALTER TABLE uses double-quotes instead of single-quotes for quoting filenames.
- Use the WHERE clause to reduce the size of a materialized VIEW in an UPDATE or DELETE statement. (Optimization)
- Do not apply the flattening optimization if the outer query is an aggregate and the inner query contains ORDER BY. (Ticket #2943)
- Additional OS/2 updates
- Added an experimental power-of-two, first-fit memory allocator.
- Remove all instances of sprintf() from the code
- Accept "Z" as the zulu timezone at the end of date strings
- Fix a bug in the LIKE optimizer that occurs when the last character before the first wildcard is an upper-case "Z"
- Added the "bitvec" object for keeping track of which pages have been journalled. Improves speed and reduces memory consumption, especially for large database files.
- Get the SQLITE_ENABLE_LOCKING_STYLE macro working again on Mac OS X.
- Store the statement journal in the temporary file directory instead of colocated with the database file.
- Many improvements and cleanups to the configure script

### 2008 Feb 6 (3.5.6)

- Fix a bug (ticket #2913) that prevented virtual tables from working in a LEFT JOIN. The problem was introduced into shortly before the 3.5.5 release.
- Bring the OS/2 porting layer up-to-date.
- Add the new sqlite3_result_error_code() API and use it in the implementation of ATTACH so that proper error codes are returned when an ATTACH fails.

### 2008 Jan 31 (3.5.5)

- Convert the underlying virtual machine to be a register-based machine rather than a stack-based machine. The only user-visible change is in the output of EXPLAIN.
- Add the build-in RTRIM collating sequence.

### 2007 Dec 14 (3.5.4)

- Fix a critical bug in UPDATE or DELETE that occurs when an OR REPLACE clause or a trigger causes rows in the same table to be deleted as side effects. (See ticket #2832.) The most likely result of this bug is a segmentation fault, though database corruption is a possibility.
- Bring the processing of ORDER BY into compliance with the SQL standard for case where a result alias and a table column name are in conflict. Correct behavior is to prefer the result alias. Older versions of SQLite incorrectly picked the table column. (See ticket #2822.)
- The VACUUM command preserves the setting of the legacy_file_format pragma. (Ticket #2804.)
- Productize and officially support the group_concat() SQL function.
- Better optimization of some IN operator expressions.
- Add the ability to change the auto_vacuum status of a database by setting the auto_vaccum pragma and VACUUMing the database.
- Prefix search in FTS3 is much more efficient.
- Relax the SQL statement length restriction in the CLI so that the ".dump" output of databases with very large BLOBs and strings can be played back to recreate the database.
- Other small bug fixes and optimizations.

### 2007 Nov 27 (3.5.3)

- Move website and documentation files out of the source tree into a separate CM system.
- Fix a long-standing bug in INSERT INTO ... SELECT ... statements where the SELECT is compound.
- Fix a long-standing bug in RAISE(IGNORE) as used in BEFORE triggers.
- Fixed the operator precedence for the ~ operator.
- On Win32, do not return an error when attempting to delete a file that does not exist.
- Allow collating sequence names to be quoted.
- Modify the TCL interface to use sqlite3_prepare_v2().
- Fix multiple bugs that can occur following a malloc() failure.
- sqlite3_step() returns SQLITE_MISUSE instead of crashing when called with a NULL parameter.
- FTS3 now uses the SQLite memory allocator exclusively. The FTS3 amalgamation can now be appended to the SQLite amalgamation to generate a super-amalgamation containing both.
- The DISTINCT keyword now will sometimes use an INDEX if an appropriate index is available and the optimizer thinks its use might be advantageous.

### 2007 Nov 05 (3.5.2)

- Dropped support for the SQLITE_OMIT_MEMORY_ALLOCATION compile-time option.
- Always open files using FILE_FLAG_RANDOM_ACCESS under Windows.
- The 3rd parameter of the built-in SUBSTR() function is now optional.
- Bug fix: do not invoke the authorizer when reparsing the schema after a schema change.
- Added the experimental malloc-free memory allocator in mem3.c.
- Virtual machine stores 64-bit integer and floating point constants in binary instead of text for a performance boost.
- Fix a race condition in test_async.c.
- Added the ".timer" command to the CLI

### 2007 Oct 04 (3.5.1)

- Nota Bene: We are not using terms "alpha" or "beta" on this release because the code is stable and because if we use those terms, nobody will upgrade. However, we still reserve the right to make incompatible changes to the new VFS interface in future releases.
- Fix a bug in the handling of SQLITE_FULL errors that could lead to database corruption. Ticket #2686.
- The test_async.c drive now does full file locking and works correctly when used simultaneously by multiple processes on the same database.
- The CLI ignores whitespace (including comments) at the end of lines
- Make sure the query optimizer checks dependences on all terms of a compound SELECT statement. Ticket #2640.
- Add demonstration code showing how to build a VFS for a raw mass storage without a filesystem.
- Added an output buffer size parameter to the xGetTempname() method of the VFS layer.
- Sticky SQLITE_FULL or SQLITE_IOERR errors in the pager are reset when a new transaction is started.

### 2007 Sep 04 (3.5.0) alpha

- Redesign the OS interface layer. See 34to35.html for details. *** Potentially incompatible change ***
- The sqlite3_release_memory(), sqlite3_soft_heap_limit(), and sqlite3_enable_shared_cache() interfaces now work cross all threads in the process, not just the single thread in which they are invoked. *** Potentially incompatible change ***
- Added the sqlite3_open_v2() interface.
- Reimplemented the memory allocation subsystem and made it replacable at compile-time.
- Created a new mutex subsystem and made it replacable at compile-time.
- The same database connection may now be used simultaneously by separate threads.

### 2007 August 13 (3.4.2)

- Fix a database corruption bug that might occur if a ROLLBACK command is executed in auto-vacuum mode and a very small sqlite3_soft_heap_limit is set. Ticket #2565.
- Add the ability to run a full regression test with a small sqlite3_soft_heap_limit.
- Fix other minor problems with using small soft heap limits.
- Work-around for GCC bug 32575.
- Improved error detection of misused aggregate functions.
- Improvements to the amalgamation generator script so that all symbols are prefixed with either SQLITE_PRIVATE or SQLITE_API.

### 2007 July 20 (3.4.1)

- Fix a bug in VACUUM that can lead to database corruption if two processes are connected to the database at the same time and one VACUUMs then the other then modifies the database.
- The expression "+column" is now considered the same as "column" when computing the collating sequence to use on the expression.
- In the TCL language interface, "@variable" instead of "$variable" always binds as a blob.
- Added PRAGMA freelist_count for determining the current size of the freelist.
- The PRAGMA auto_vacuum=incremental setting is now persistent.
- Add FD_CLOEXEC to all open files under Unix.
- Fix a bug in the min()/max() optimization when applied to descending indices.
- Make sure the TCL language interface works correctly with 64-bit integers on 64-bit machines.
- Allow the value -9223372036854775808 as an integer literal in SQL statements.
- Add the capability of "hidden" columns in virtual tables.
- Use the macro SQLITE_PRIVATE (defaulting to "static") on all internal functions in the amalgamation.
- Add pluggable tokenizers and ICU tokenization support to FTS2
- Other minor bug fixes and documentation enhancements

### 2007 June 18 (3.4.0)

- Fix a bug that can lead to database corruption if an SQLITE_BUSY error occurs in the middle of an explicit transaction and that transaction is later committed. Ticket #2409. See the CorruptionFollowingBusyError wiki page for details.
- Fix a bug that can lead to database corruption if autovacuum mode is on and a malloc() failure follows a CREATE TABLE or CREATE INDEX statement which itself follows a cache overflow inside a transaction. See ticket #2418.
- Added explicit upper bounds on the sizes and quantities of things SQLite can process. This change might cause compatibility problems for applications that use SQLite in the extreme, which is why the current release is 3.4.0 instead of 3.3.18.
- Added support for Incremental BLOB I/O.
- Added the sqlite3_bind_zeroblob() API and the zeroblob() SQL function.
- Added support for Incremental Vacuum.
- Added the SQLITE_MIXED_ENDIAN_64BIT_FLOAT compile-time option to suppport ARM7 processors with goofy endianness.
- Removed all instances of sprintf() and strcpy() from the core library.
- Added support for International Components for Unicode (ICU) to the full-text search extensions.

- In the Windows OS driver, reacquire a SHARED lock if an attempt to acquire an EXCLUSIVE lock fails. Ticket #2354
- Fix the REPLACE() function so that it returns NULL if the second argument is an empty string. Ticket #2324.
- Document the hazards of type coversions in sqlite3_column_blob() and related APIs. Fix unnecessary type conversions. Ticket #2321.
- Internationalization of the TRIM() function. Ticket #2323
- Use memmove() instead of memcpy() when moving between memory regions that might overlap. Ticket #2334
- Fix an optimizer bug involving subqueries in a compound SELECT that has both an ORDER BY and a LIMIT clause. Ticket #2339.
- Make sure the sqlite3_snprintf() interface does not zero-terminate the buffer if the buffer size is less than 1. Ticket #2341
- Fix the built-in printf logic so that it prints "NaN" not "Inf" for floating-point NaNs. Ticket #2345
- When converting BLOB to TEXT, use the text encoding of the main database. Ticket #2349
- Keep the full precision of integers (if possible) when casting to NUMERIC. Ticket #2364
- Fix a bug in the handling of UTF16 codepoint 0xE000
- Consider explicit collate clauses when matching WHERE constraints to indices in the query optimizer. Ticket #2391
- Fix the query optimizer to correctly handle constant expressions in the ON clause of a LEFT JOIN. Ticket #2403
- Fix the query optimizer to handle rowid comparisions to NULL correctly. Ticket #2404
- Fix many potental segfaults that could be caused by malicious SQL statements.

### 2007 April 25 (3.3.17)

- When the "write_version" value of the database header is larger than what the library understands, make the database read-only instead of unreadable.
- Other minor bug fixes

### 2007 April 18 (3.3.16)

- Fix a bug that caused VACUUM to fail if NULLs appeared in a UNIQUE column.
- Reinstate performance improvements that were added in Version 3.3.14 but regressed in Version 3.3.15.
- Fix problems with the handling of ORDER BY expressions on compound SELECT statements in subqueries.
- Fix a potential segfault when destroying locks on WinCE in a multi-threaded environment.
- Documentation updates.

### 2007 April 9 (3.3.15)

- Fix a bug introduced in 3.3.14 that caused a rollback of CREATE TEMP TABLE to leave the database connection wedged.
- Fix a bug that caused an extra NULL row to be returned when a descending query was interrupted by a change to the database.
- The FOR EACH STATEMENT clause on a trigger now causes a syntax error. It used to be silently ignored.
- Fix an obscure and relatively harmless problem that might have caused a resource leak following an I/O error.
- Many improvements to the test suite. Test coverage now exceeded 98%

### 2007 April 2 (3.3.14)

- Fix a bug (ticket #2273) that could cause a segfault when the IN operator is used one one term of a two-column index and the right-hand side of the IN operator contains a NULL.
- Added a new OS interface method for determining the sector size of underlying media: sqlite3OsSectorSize().
- A new algorithm for statements of the form INSERT INTO table1 SELECT * FROM table2 is faster and reduces fragmentation. VACUUM uses statements of this form and thus runs faster and defragments better.
- Performance enhancements through reductions in disk I/O:
  - Do not read the last page of an overflow chain when deleting the row - just add that page to the freelist.
  - Do not store pages being deleted in the rollback journal.
  - Do not read in the (meaningless) content of pages extracted from the freelist.
  - Do not flush the page cache (and thus avoiding a cache refill) unless another process changes the underlying database file.
  - Truncate rather than delete the rollback journal when committing a transaction in exclusive access mode, or when committing the TEMP database.
- Added support for exclusive access mode using "PRAGMA locking_mode=EXCLUSIVE"
- Use heap space instead of stack space for large buffers in the pager - useful on embedded platforms with stack-space limitations.
- Add a makefile target "sqlite3.c" that builds an amalgamation containing the core SQLite library C code in a single file.
- Get the library working correctly when compiled with GCC option "-fstrict-aliasing".
- Removed the vestigal SQLITE_PROTOCOL error.
- Improvements to test coverage, other minor bugs fixed, memory leaks plugged, code refactored and/or recommented in places for easier reading.

### 2007 February 13 (3.3.13)

- Add a "fragmentation" measurement in the output of sqlite3_analyzer.
- Add the COLLATE operator used to explicitly set the collating sequence used by an expression. This feature is considered experimental pending additional testing.
- Allow up to 64 tables in a join - the old limit was 32.
- Added two new experimental functions: randomBlob() and hex(). Their intended use is to facilitate generating UUIDs.
- Fix a problem where PRAGMA count_changes was causing incorrect results for updates on tables with triggers
- Fix a bug in the ORDER BY clause optimizer for joins where the left-most table in the join is constrained by a UNIQUE index.
- Fixed a bug in the "copy" method of the TCL interface.
- Bug fixes in fts1 and fts2 modules.

### 2007 January 27 (3.3.12)

- Fix another bug in the IS NULL optimization that was added in version 3.3.9.
- Fix a assertion fault that occurred on deeply nested views.
- Limit the amount of output that PRAGMA integrity_check generates.
- Minor syntactic changes to support a wider variety of compilers.

### 2007 January 22 (3.3.11)

- Fix another bug in the implementation of the new sqlite3_prepare_v2() API. We'll get it right eventually...
- Fix a bug in the IS NULL optimization that was added in version 3.3.9 - the bug was causing incorrect results on certain LEFT JOINs that included in the WHERE clause an IS NULL constraint for the right table of the LEFT JOIN.
- Make AreFileApisANSI() a no-op macro in winCE since winCE does not support this function.

### 2007 January 9 (3.3.10)

- Fix bugs in the implementation of the new sqlite3_prepare_v2() API that can lead to segfaults.
- Fix 1-second round-off errors in the strftime() function
- Enhance the Windows OS layer to provide detailed error codes
- Work around a win2k problem so that SQLite can use single-character database file names
- The user_version and schema_version pragmas correctly set their column names in the result set
- Documentation updates

### 2007 January 4 (3.3.9)

- Fix bugs in pager.c that could lead to database corruption if two processes both try to recover a hot journal at the same instant
- Added the sqlite3_prepare_v2() API.
- Fixed the ".dump" command in the command-line shell to show indices, triggers and views again.
- Change the table_info pragma so that it returns NULL for the default value if there is no default value
- Support for non-ASCII characters in win95 filenames
- Query optimizer enhancements:
  - Optimizer does a better job of using indices to satisfy ORDER BY clauses that sort on the integer primary key
  - Use an index to satisfy an IS NULL operator in the WHERE clause
  - Fix a bug that was causing the optimizer to miss an OR optimization opportunity
  - The optimizer has more freedom to reorder tables in the FROM clause even in there are LEFT joins.
- Extension loading supported added to winCE
- Allow constraint names on the DEFAULT clause in a table definition
- Added the ".bail" command to the command-line shell
- Make CSV (comma separate value) output from the command-line shell more closely aligned to accepted practice
- Experimental FTS2 module added
- Use sqlite3_mprintf() instead of strdup() to avoid libc dependencies
- VACUUM uses a temporary file in the official TEMP folder, not in the same directory as the original database
- The prefix on temporary filenames on Windows is changed from "sqlite" to "etilqs".

### 2006 October 9 (3.3.8)

- Support for full text search using the FTS1 module (beta)
- Added OS-X locking patches (beta - disabled by default)
- Introduce extended error codes and add error codes for various kinds of I/O errors.
- Added support for IF EXISTS on CREATE/DROP TRIGGER/VIEW
- Fix the regression test suite so that it works with Tcl8.5
- Enhance sqlite3_set_authorizer() to provide notification of calls to SQL functions.
- Added experimental API: sqlite3_auto_extension()
- Various minor bug fixes

### 2006 August 12 (3.3.7)

- Added support for virtual tables (beta)
- Added support for dynamically loaded extensions (beta)
- The sqlite3_interrupt() routine can be called for a different thread
- Added the MATCH operator.
- The default file format is now 1.

### 2006 June 6 (3.3.6)

- Plays better with virus scanners on Windows
- Faster :memory: databases
- Fix an obscure segfault in UTF-8 to UTF-16 conversions
- Added driver for OS/2
- Correct column meta-information returned for aggregate queries
- Enhanced output from EXPLAIN QUERY PLAN
- LIMIT 0 now works on subqueries
- Bug fixes and performance enhancements in the query optimizer
- Correctly handle NULL filenames in ATTACH and DETACH
- Inproved syntax error messages in the parser
- Fix type coercion rules for the IN operator

### 2006 April 5 (3.3.5)

- CHECK constraints use conflict resolution algorithms correctly.
- The SUM() function throws an error on integer overflow.
- Choose the column names in a compound query from the left-most SELECT instead of the right-most.
- The sqlite3_create_collation() function honors the SQLITE_UTF16_ALIGNED flag.
- SQLITE_SECURE_DELETE compile-time option causes deletes to overwrite old data with zeros.
- Detect integer overflow in abs().
- The random() function provides 64 bits of randomness instead of only 32 bits.
- Parser detects and reports automaton stack overflow.
- Change the round() function to return REAL instead of TEXT.
- Allow WHERE clause terms on the left table of a LEFT OUTER JOIN to contain aggregate subqueries.
- Skip over leading spaces in text to numeric conversions.
- Various minor bug and documentation typo fixes and performance enhancements.

### 2006 February 11 (3.3.4)

- Fix a blunder in the Unix mutex implementation that can lead to deadlock on multithreaded systems.
- Fix an alignment problem on 64-bit machines
- Added the fullfsync pragma.
- Fix an optimizer bug that could have caused some unusual LEFT OUTER JOINs to give incorrect results.
- The SUM function detects integer overflow and converts to accumulating an approximate result using floating point numbers
- Host parameter names can begin with '@' for compatibility with SQL Server.
- Other miscellaneous bug fixes

### 2006 January 31 (3.3.3)

- Removed support for an ON CONFLICT clause on CREATE INDEX - it never worked correctly so this should not present any backward compatibility problems.
- Authorizer callback now notified of ALTER TABLE ADD COLUMN commands
- After any changes to the TEMP database schema, all prepared statements are invalidated and must be recreated using a new call to sqlite3_prepare()
- Other minor bug fixes in preparation for the first stable release of version 3.3

### 2006 January 24 (3.3.2 beta)

- Bug fixes and speed improvements. Improved test coverage.
- Changes to the OS-layer interface: mutexes must now be recursive.
- Discontinue the use of thread-specific data for out-of-memory exception handling

### 2006 January 16 (3.3.1 alpha)

- Countless bug fixes
- Speed improvements
- Database connections can now be used by multiple threads, not just the thread in which they were created.

### 2006 January 10 (3.3.0 alpha)

- CHECK constraints
- IF EXISTS and IF NOT EXISTS clauses on CREATE/DROP TABLE/INDEX.
- DESC indices
- More efficient encoding of boolean values resulting in smaller database files
- More aggressive SQLITE_OMIT_FLOATING_POINT
- Separate INTEGER and REAL affinity
- Added a virtual function layer for the OS interface
- "exists" method added to the TCL interface
- Improved response to out-of-memory errors
- Database cache can be optionally shared between connections in the same thread
- Optional READ UNCOMMITTED isolation (instead of the default isolation level of SERIALIZABLE) and table level locking when database connections share a common cache.

### 2005 December 19 (3.2.8)

- Fix an obscure bug that can cause database corruption under the following unusual circumstances: A large INSERT or UPDATE statement which is part of an even larger transaction fails due to a uniqueness contraint but the containing transaction commits.

### 2005 December 19 (2.8.17)

- Fix an obscure bug that can cause database corruption under the following unusual circumstances: A large INSERT or UPDATE statement which is part of an even larger transaction fails due to a uniqueness contraint but the containing transaction commits.

### 2005 September 24 (3.2.7)

- GROUP BY now considers NULLs to be equal again, as it should
- Now compiles on Solaris and OpenBSD and other Unix variants that lack the fdatasync() function
- Now compiles on MSVC++6 again
- Fix uninitialized variables causing malfunctions for various obscure queries
- Correctly compute a LEFT OUTER JOINs that is constrained on the left table only

### 2005 September 17 (3.2.6)

- Fix a bug that can cause database corruption if a VACUUM (or autovacuum) fails and is rolled back on a database that is larger than 1GiB
- LIKE optiization now works for columns with COLLATE NOCASE
- ORDER BY and GROUP BY now use bounded memory
- Added support for COUNT(DISTINCT expr)
- Change the way SUM() handles NULL values in order to comply with the SQL standard
- Use fdatasync() instead of fsync() where possible in order to speed up commits slightly
- Use of the CROSS keyword in a join turns off the table reordering optimization
- Added the experimental and undocumented EXPLAIN QUERY PLAN capability
- Use the unicode API in Windows

### 2005 August 27 (3.2.5)

- Fix a bug effecting DELETE and UPDATE statements that changed more than 40960 rows.
- Change the makefile so that it no longer requires GNUmake extensions
- Fix the --enable-threadsafe option on the configure script
- Fix a code generator bug that occurs when the left-hand side of an IN operator is constant and the right-hand side is a SELECT statement
- The PRAGMA synchronous=off statement now disables syncing of the master journal file in addition to the normal rollback journals

### 2005 August 24 (3.2.4)

- Fix a bug introduced in the previous release that can cause a segfault while generating code for complex WHERE clauses.
- Allow floating point literals to begin or end with a decimal point.

### 2005 August 21 (3.2.3)

- Added support for the CAST operator
- Tcl interface allows BLOB values to be transferred to user-defined functions
- Added the "transaction" method to the Tcl interface
- Allow the DEFAULT value of a column to call functions that have constant operands
- Added the ANALYZE command for gathering statistics on indices and using those statistics when picking an index in the optimizer
- Remove the limit (formerly 100) on the number of terms in the WHERE clause
- The right-hand side of the IN operator can now be a list of expressions instead of just a list of constants
- Rework the optimizer so that it is able to make better use of indices
- The order of tables in a join is adjusted automatically to make better use of indices
- The IN operator is now a candidate for optimization even if the left-hand side is not the left-most term of the index. Multiple IN operators can be used with the same index.
- WHERE clause expressions using BETWEEN and OR are now candidates for optimization
- Added the "case_sensitive_like" pragma and the SQLITE_CASE_SENSITIVE_LIKE compile-time option to set its default value to "on".
- Use indices to help with GLOB expressions and LIKE expressions too when the case_sensitive_like pragma is enabled
- Added support for grave-accent quoting for compatibility with MySQL
- Improved test coverage
- Dozens of minor bug fixes

### 2005 June 13 (3.2.2)

- Added the sqlite3_db_handle() API
- Added the sqlite3_get_autocommit() API
- Added a REGEXP operator to the parser. There is no function to back up this operator in the standard build but users can add their own using sqlite3_create_function()
- Speed improvements and library footprint reductions.
- Fix byte alignment problems on 64-bit architectures.
- Many, many minor bug fixes and documentation updates.

### 2005 March 29 (3.2.1)

- Fix a memory allocation error in the new ADD COLUMN comment.
- Documentation updates

### 2005 March 21 (3.2.0)

- Added support for ALTER TABLE ADD COLUMN.
- Added support for the "T" separator in ISO-8601 date/time strings.
- Improved support for Cygwin.
- Numerous bug fixes and documentation updates.

### 2005 March 16 (3.1.6)

- Fix a bug that could cause database corruption when inserting record into tables with around 125 columns.
- sqlite3_step() is now much more likely to invoke the busy handler and less likely to return SQLITE_BUSY.
- Fix memory leaks that used to occur after a malloc() failure.

### 2005 March 11 (3.1.5)

- The ioctl on OS-X to control syncing to disk is F_FULLFSYNC, not F_FULLSYNC. The previous release had it wrong.

### 2005 March 10 (3.1.4)

- Fix a bug in autovacuum that could cause database corruption if a CREATE UNIQUE INDEX fails because of a constraint violation. This problem only occurs if the new autovacuum feature introduced in version 3.1 is turned on.
- The F_FULLSYNC ioctl (currently only supported on OS-X) is disabled if the synchronous pragma is set to something other than "full".
- Add additional forward compatibility to the future version 3.2 database file format.
- Fix a bug in WHERE clauses of the form (rowid<'2')
- New SQLITE_OMIT_... compile-time options added
- Updates to the man page
- Remove the use of strcasecmp() from the shell
- Windows DLL exports symbols Tclsqlite_Init and Sqlite_Init

### 2005 February 19 (3.1.3)

- Fix a problem with VACUUM on databases from which tables containing AUTOINCREMENT have been dropped.
- Add forward compatibility to the future version 3.2 database file format.
- Documentation updates

### 2005 February 15 (3.1.2)

- Fix a bug that can lead to database corruption if there are two open connections to the same database and one connection does a VACUUM and the second makes some change to the database.
- Allow "?" parameters in the LIMIT clause.
- Fix VACUUM so that it works with AUTOINCREMENT.
- Fix a race condition in AUTOVACUUM that can lead to corrupt databases
- Add a numeric version number to the sqlite3.h include file.
- Other minor bug fixes and performance enhancements.

### 2005 February 15 (2.8.16)

- Fix a bug that can lead to database corruption if there are two open connections to the same database and one connection does a VACUUM and the second makes some change to the database.
- Correctly handle quoted names in CREATE INDEX statements.
- Fix a naming conflict between sqlite.h and sqlite3.h.
- Avoid excess heap usage when copying expressions.
- Other minor bug fixes.

### 2005 February 1 (3.1.1 BETA)

- Automatic caching of prepared statements in the TCL interface
- ATTACH and DETACH as well as some other operations cause existing prepared statements to expire.
- Numerious minor bug fixes

### 2005 January 21 (3.1.0 ALPHA)

- Autovacuum support added
- CURRENT_TIME, CURRENT_DATE, and CURRENT_TIMESTAMP added
- Support for the EXISTS clause added.
- Support for correlated subqueries added.
- Added the ESCAPE clause on the LIKE operator.
- Support for ALTER TABLE ... RENAME TABLE ... added
- AUTOINCREMENT keyword supported on INTEGER PRIMARY KEY
- Many SQLITE_OMIT_ macros inserts to omit features at compile-time and reduce the library footprint.
- The REINDEX command was added.
- The engine no longer consults the main table if it can get all the information it needs from an index.
- Many nuisance bugs fixed.

### 2004 October 11 (3.0.8)

- Add support for DEFERRED, IMMEDIATE, and EXCLUSIVE transactions.
- Allow new user-defined functions to be created when there are already one or more precompiled SQL statements.
- Fix portability problems for Mingw/MSYS.
- Fix a byte alignment problem on 64-bit Sparc machines.
- Fix the ".import" command of the shell so that it ignores \r characters at the end of lines.
- The "csv" mode option in the shell puts strings inside double-quotes.
- Fix typos in documentation.
- Convert array constants in the code to have type "const".
- Numerous code optimizations, specially optimizations designed to make the code footprint smaller.

### 2004 September 18 (3.0.7)

- The BTree module allocates large buffers using malloc() instead of off of the stack, in order to play better on machines with limited stack space.
- Fixed naming conflicts so that versions 2.8 and 3.0 can be linked and used together in the same ANSI-C source file.
- New interface: sqlite3_bind_parameter_index()
- Add support for wildcard parameters of the form: "?nnn"
- Fix problems found on 64-bit systems.
- Removed encode.c file (containing unused routines) from the version 3.0 source tree.
- The sqlite3_trace() callbacks occur before each statement is executed, not when the statement is compiled.
- Makefile updates and miscellaneous bug fixes.

### 2004 September 02 (3.0.6 beta)

- Better detection and handling of corrupt database files.
- The sqlite3_step() interface returns SQLITE_BUSY if it is unable to commit a change because of a lock
- Combine the implementations of LIKE and GLOB into a single pattern-matching subroutine.
- Miscellaneous code size optimizations and bug fixes

### 2004 August 29 (3.0.5 beta)

- Support for ":AAA" style bind parameter names.
- Added the new sqlite3_bind_parameter_name() interface.
- Support for TCL variable names embedded in SQL statements in the TCL bindings.
- The TCL bindings transfer data without necessarily doing a conversion to a string.
- The database for TEMP tables is not created until it is needed.
- Add the ability to specify an alternative temporary file directory using the "sqlite_temp_directory" global variable.
- A compile-time option (SQLITE_BUSY_RESERVED_LOCK) causes the busy handler to be called when there is contention for a RESERVED lock.
- Various bug fixes and optimizations

### 2004 August 8 (3.0.4 beta)

- CREATE TABLE and DROP TABLE now work correctly as prepared statements.
- Fix a bug in VACUUM and UNIQUE indices.
- Add the ".import" command to the command-line shell.
- Fix a bug that could cause index corruption when an attempt to delete rows of a table is blocked by a pending query.
- Library size optimizations.
- Other minor bug fixes.

### 2004 July 22 (2.8.15)

- This is a maintenance release only. Various minor bugs have been fixed and some portability enhancements are added.

### 2004 July 22 (3.0.3 beta)

- The second beta release for SQLite 3.0.
- Add support for "PRAGMA page_size" to adjust the page size of the database.
- Various bug fixes and documentation updates.

### 2004 June 30 (3.0.2 beta)

- The first beta release for SQLite 3.0.

### 2004 June 22 (3.0.1 alpha)

- *** Alpha Release - Research And Testing Use Only ***
- Lots of bug fixes.

### 2004 June 18 (3.0.0 alpha)

- *** Alpha Release - Research And Testing Use Only ***
- Support for internationalization including UTF-8, UTF-16, and user defined collating sequences.
- New file format that is 25% to 35% smaller for typical use.
- Improved concurrency.
- Atomic commits for ATTACHed databases.
- Remove cruft from the APIs.
- BLOB support.
- 64-bit rowids.
- More information.

### 2004 June 9 (2.8.14)

- Fix the min() and max() optimizer so that it works when the FROM clause consists of a subquery.
- Ignore extra whitespace at the end of of "." commands in the shell.
- Bundle sqlite_encode_binary() and sqlite_decode_binary() with the library.
- The TEMP_STORE and DEFAULT_TEMP_STORE pragmas now work.
- Code changes to compile cleanly using OpenWatcom.
- Fix VDBE stack overflow problems with INSTEAD OF triggers and NULLs in IN operators.
- Add the global variable sqlite_temp_directory which if set defines the directory in which temporary files are stored.
- sqlite_interrupt() plays well with VACUUM.
- Other minor bug fixes.

### 2004 March 8 (2.8.13)

- Refactor parts of the code in order to make the code footprint smaller. The code is now also a little bit faster.
- sqlite_exec() is now implemented as a wrapper around sqlite_compile() and sqlite_step().
- The built-in min() and max() functions now honor the difference between NUMERIC and TEXT datatypes. Formerly, min() and max() always assumed their arguments were of type NUMERIC.
- New HH:MM:SS modifier to the built-in date/time functions.
- Experimental sqlite_last_statement_changes() API added. Fixed the the last_insert_rowid() function so that it works correctly with triggers.
- Add functions prototypes for the database encryption API.
- Fix several nuisance bugs.

### 2004 February 8 (2.8.12)

- Fix a bug that will might corrupt the rollback journal if a power failure or external program halt occurs in the middle of a COMMIT. The corrupt journal can lead to database corruption when it is rolled back.
- Reduce the size and increase the speed of various modules, especially the virtual machine.
- Allow "<expr> IN <table>" as a shorthand for "<expr> IN (SELECT * FROM <table>".
- Optimizations to the sqlite_mprintf() routine.
- Make sure the MIN() and MAX() optimizations work within subqueries.

### 2004 January 14 (2.8.11)

- Fix a bug in how the IN operator handles NULLs in subqueries. The bug was introduced by the previous release.

### 2004 January 13 (2.8.10)

- Fix a potential database corruption problem on Unix caused by the fact that all POSIX advisory locks are cleared whenever you close() a file. The work around it to embargo all close() calls while locks are outstanding.
- Performance enhancements on some corner cases of COUNT(*).
- Make sure the in-memory backend response sanely if malloc() fails.
- Allow sqlite_exec() to be called from within user-defined SQL functions.
- Improved accuracy of floating-point conversions using "long double".
- Bug fixes in the experimental date/time functions.

### 2004 January 5 (2.8.9)

- Fix a 32-bit integer overflow problem that could result in corrupt indices in a database if large negative numbers (less than -2147483648) were inserted into a indexed numeric column.
- Fix a locking problem on multi-threaded Linux implementations.
- Always use "." instead of "," as the decimal point even if the locale requests ",".
- Added UTC to localtime conversions to the experimental date/time functions.
- Bug fixes to date/time functions.

### 2003 December 17 (2.8.8)

- Fix a critical bug introduced into 2.8.0 which could cause database corruption.
- Fix a problem with 3-way joins that do not use indices
- The VACUUM command now works with the non-callback API
- Improvements to the "PRAGMA integrity_check" command

### 2003 December 4 (2.8.7)

- Added experimental sqlite_bind() and sqlite_reset() APIs.
- If the name of the database is an empty string, open a new database in a temporary file that is automatically deleted when the database is closed.
- Performance enhancements in the lemon-generated parser
- Experimental date/time functions revised.
- Disallow temporary indices on permanent tables.
- Documentation updates and typo fixes
- Added experimental sqlite_progress_handler() callback API
- Removed support for the Oracle8 outer join syntax.
- Allow GLOB and LIKE operators to work as functions.
- Other minor documentation and makefile changes and bug fixes.

### 2003 August 21 (2.8.6)

- Moved the CVS repository to www.sqlite.org
- Update the NULL-handling documentation.
- Experimental date/time functions added.
- Bug fix: correctly evaluate a view of a view without segfaulting.
- Bug fix: prevent database corruption if you dropped a trigger that had the same name as a table.
- Bug fix: allow a VACUUM (without segfaulting) on an empty database after setting the EMPTY_RESULT_CALLBACKS pragma.
- Bug fix: if an integer value will not fit in a 32-bit int, store it in a double instead.
- Bug fix: Make sure the journal file directory entry is committed to disk before writing the database file.

### 2003 July 22 (2.8.5)

- Make LIMIT work on a compound SELECT statement.
- LIMIT 0 now shows no rows. Use LIMIT -1 to see all rows.
- Correctly handle comparisons between an INTEGER PRIMARY KEY and a floating point number.
- Fix several important bugs in the new ATTACH and DETACH commands.
- Updated the NULL-handling document.
- Allow NULL arguments in sqlite_compile() and sqlite_step().
- Many minor bug fixes

### 2003 June 29 (2.8.4)

- Enhanced the "PRAGMA integrity_check" command to verify indices.
- Added authorization hooks for the new ATTACH and DETACH commands.
- Many documentation updates
- Many minor bug fixes

### 2003 June 4 (2.8.3)

- Fix a problem that will corrupt the indices on a table if you do an INSERT OR REPLACE or an UPDATE OR REPLACE on a table that contains an INTEGER PRIMARY KEY plus one or more indices.
- Fix a bug in Windows locking code so that locks work correctly when simultaneously accessed by Win95 and WinNT systems.
- Add the ability for INSERT and UPDATE statements to refer to the "rowid" (or "_rowid_" or "oid") columns.
- Other important bug fixes

### 2003 May 17 (2.8.2)

- Fix a problem that will corrupt the database file if you drop a table from the main database that has a TEMP index.

### 2003 May 16 (2.8.1)

- Reactivated the VACUUM command that reclaims unused disk space in a database file.
- Added the ATTACH and DETACH commands to allow interacting with multiple database files at the same time.
- Added support for TEMP triggers and indices.
- Added support for in-memory databases.
- Removed the experimental sqlite_open_aux_file(). Its function is subsumed in the new ATTACH command.
- The precedence order for ON CONFLICT clauses was changed so that ON CONFLICT clauses on BEGIN statements have a higher precedence than ON CONFLICT clauses on constraints.
- Many, many bug fixes and compatibility enhancements.

### 2003 Feb 16 (2.8.0)

- Modified the journal file format to make it more resistant to corruption that can occur after an OS crash or power failure.
- Added a new C/C++ API that does not use callback for returning data.

### 2003 Jan 25 (2.7.6)

- Performance improvements. The library is now much faster.
- Added the sqlite_set_authorizer() API. Formal documentation has not been written - see the source code comments for instructions on how to use this function.
- Fix a bug in the GLOB operator that was preventing it from working with upper-case letters.
- Various minor bug fixes.

### 2002 Dec 27 (2.7.5)

- Fix an uninitialized variable in pager.c which could (with a probability of about 1 in 4 billion) result in a corrupted database.

### 2002 Dec 17 (2.7.4)

- Database files can now grow to be up to 2^41 bytes. The old limit was 2^31 bytes.
- The optimizer will now scan tables in the reverse if doing so will satisfy an ORDER BY ... DESC clause.
- The full pathname of the database file is now remembered even if a relative path is passed into sqlite_open(). This allows the library to continue operating correctly after a chdir().
- Speed improvements in the VDBE.
- Lots of little bug fixes.

### 2002 Oct 30 (2.7.3)

- Various compiler compatibility fixes.
- Fix a bug in the "expr IN ()" operator.
- Accept column names in parentheses.
- Fix a problem with string memory management in the VDBE
- Fix a bug in the "table_info" pragma"
- Export the sqlite_function_type() API function in the Windows DLL
- Fix locking behavior under Windows
- Fix a bug in LEFT OUTER JOIN

### 2002 Sep 25 (2.7.2)

- Prevent journal file overflows on huge transactions.
- Fix a memory leak that occurred when sqlite_open() failed.
- Honor the ORDER BY and LIMIT clause of a SELECT even if the result set is used for an INSERT.
- Do not put write locks on the file used to hold TEMP tables.
- Added documentation on SELECT DISTINCT and on how SQLite handles NULLs.
- Fix a problem that was causing poor performance when many thousands of SQL statements were executed by a single sqlite_exec() call.

### 2002 Aug 31 (2.7.1)

- Fix a bug in the ORDER BY logic that was introduced in version 2.7.0
- C-style comments are now accepted by the tokenizer.
- INSERT runs a little faster when the source is a SELECT statement.

### 2002 Aug 25 (2.7.0)

- Make a distinction between numeric and text values when sorting. Text values sort according to memcmp(). Numeric values sort in numeric order.
- Allow multiple simultaneous readers under Windows by simulating the reader/writers locks that are missing from Win95/98/ME.
- An error is now returned when trying to start a transaction if another transaction is already active.

### 2002 Aug 12 (2.6.3)

- Add the ability to read both little-endian and big-endian databases. So a database created under SunOS or Mac OS X can be read and written under Linux or Windows and vice versa.
- Convert to the new website: http://www.sqlite.org/
- Allow transactions to span Linux Threads
- Bug fix in the processing of the ORDER BY clause for GROUP BY queries

### 2002 Jly 30 (2.6.2)

- Text files read by the COPY command can now have line terminators of LF, CRLF, or CR.
- SQLITE_BUSY is handled correctly if encountered during database initialization.
- Fix to UPDATE triggers on TEMP tables.
- Documentation updates.

### 2002 Jly 19 (2.6.1)

- Include a static string in the library that responds to the RCS "ident" command and which contains the library version number.
- Fix an assertion failure that occurred when deleting all rows of a table with the "count_changes" pragma turned on.
- Better error reporting when problems occur during the automatic 2.5.6 to 2.6.0 database format upgrade.

### 2002 Jly 17 (2.6.0)

- Change the format of indices to correct a design flaw the originated with version 2.1.0. *** This is an incompatible file format change *** When version 2.6.0 or later of the library attempts to open a database file created by version 2.5.6 or earlier, it will automatically and irreversibly convert the file format. Make backup copies of older database files before opening them with version 2.6.0 of the library.

### 2002 Jly 7 (2.5.6)

- Fix more problems with rollback. Enhance the test suite to exercise the rollback logic extensively in order to prevent any future problems.

### 2002 Jly 6 (2.5.5)

- Fix a bug which could cause database corruption during a rollback. This bugs was introduced in version 2.4.0 by the freelist optimization of checkin [410].
- Fix a bug in aggregate functions for VIEWs.
- Other minor changes and enhancements.

### 2002 Jly 1 (2.5.4)

- Make the "AS" keyword optional again.
- The datatype of columns now appear in the 4th argument to the callback.
- Added the sqlite_open_aux_file() API, though it is still mostly undocumented and untested.
- Added additional test cases and fixed a few bugs that those test cases found.

### 2002 Jun 24 (2.5.3)

- Bug fix: Database corruption can occur due to the optimization that was introduced in version 2.4.0 (check-in [410]). The problem should now be fixed. The use of versions 2.4.0 through 2.5.2 is not recommended.

### 2002 Jun 24 (2.5.2)

- Added the new SQLITE_TEMP_MASTER table which records the schema for temporary tables in the same way that SQLITE_MASTER does for persistent tables.
- Added an optimization to UNION ALL
- Fixed a bug in the processing of LEFT OUTER JOIN
- The LIMIT clause now works on subselects
- ORDER BY works on subselects
- There is a new TypeOf() function used to determine if an expression is numeric or text.
- Autoincrement now works for INSERT from a SELECT.

### 2002 Jun 19 (2.5.1)

- The query optimizer now attempts to implement the ORDER BY clause using an index. Sorting is still used if not suitable index is available.

### 2002 Jun 17 (2.5.0)

- Added support for row triggers.
- Added SQL-92 compliant handling of NULLs.
- Add support for the full SQL-92 join syntax and LEFT OUTER JOINs.
- Double-quoted strings interpreted as column names not text literals.
- Parse (but do not implement) foreign keys.
- Performance improvements in the parser, pager, and WHERE clause code generator.
- Make the LIMIT clause work on subqueries. (ORDER BY still does not work, though.)
- Added the "%Q" expansion to sqlite_*_printf().
- Bug fixes too numerous to mention (see the change log).

### 2002 May 09 (2.4.12)

- Added logic to detect when the library API routines are called out of sequence.

### 2002 May 08 (2.4.11)

- Bug fix: Column names in the result set were not being generated correctly for some (rather complex) VIEWs. This could cause a segfault under certain circumstances.

### 2002 May 02 (2.4.10)

- Bug fix: Generate correct column headers when a compound SELECT is used as a subquery.
- Added the sqlite_encode_binary() and sqlite_decode_binary() functions to the source tree. But they are not yet linked into the library.
- Documentation updates.
- Export the sqlite_changes() function from Windows DLLs.
- Bug fix: Do not attempt the subquery flattening optimization on queries that lack a FROM clause. To do so causes a segfault.

### 2002 Apr 21 (2.4.9)

- Fix a bug that was causing the precompiled binary of SQLITE.EXE to report "out of memory" under Windows 98.

### 2002 Apr 20 (2.4.8)

- Make sure VIEWs are created after their corresponding TABLEs in the output of the .dump command in the shell.
- Speed improvements: Do not do synchronous updates on TEMP tables.
- Many improvements and enhancements to the shell.
- Make the GLOB and LIKE operators functions that can be overridden by a programmer. This allows, for example, the LIKE operator to be changed to be case sensitive.

### 2002 Apr 06 (2.4.7)

- Add the ability to put TABLE.* in the column list of a SELECT statement.
- Permit SELECT statements without a FROM clause.
- Added the last_insert_rowid() SQL function.
- Do not count rows where the IGNORE conflict resolution occurs in the row count.
- Make sure functions expressions in the VALUES clause of an INSERT are correct.
- Added the sqlite_changes() API function to return the number of row that changed in the most recent operation.

### 2002 Apr 02 (2.4.6)

- Bug fix: Correctly handle terms in the WHERE clause of a join that do not contain a comparison operator.

### 2002 Apr 01 (2.4.5)

- Bug fix: Correctly handle functions that appear in the WHERE clause of a join.
- When the PRAGMA vdbe_trace=ON is set, correctly print the P3 operand value when it is a pointer to a structure rather than a pointer to a string.
- When inserting an explicit NULL into an INTEGER PRIMARY KEY, convert the NULL value into a unique key automatically.

### 2002 Mar 24 (2.4.4)

- Allow "VIEW" to be a column name
- Added support for CASE expressions (patch from Dan Kennedy)
- Added RPMS to the delivery (patches from Doug Henry)
- Fix typos in the documentation
- Cut over configuration management to a new CVS repository with its own CVSTrac bug tracking system.

### 2002 Mar 22 (2.4.3)

- Fix a bug in SELECT that occurs when a compound SELECT is used as a subquery in the FROM of a SELECT.
- The sqlite_get_table() function now returns an error if you give it two or more SELECTs that return different numbers of columns.

### 2002 Mar 14 (2.4.2)

- Bug fix: Fix an assertion failure that occurred when ROWID was a column in a SELECT statement on a view.
- Bug fix: Fix an uninitialized variable in the VDBE that would could an assert failure.
- Make the os.h header file more robust in detecting when the compile is for Windows and when it is for Unix.

### 2002 Mar 13 (2.4.1)

- Using an unnamed subquery in a FROM clause would cause a segfault.
- The parser now insists on seeing a semicolon or the end of input before executing a statement. This avoids an accidental disaster if the WHERE keyword is misspelled in an UPDATE or DELETE statement.

### 2002 Mar 10 (2.4.0)

- Change the name of the sanity_check PRAGMA to integrity_check and make it available in all compiles.
- SELECT min() or max() of an indexed column with no WHERE or GROUP BY clause is handled as a special case which avoids a complete table scan.
- Automatically generated ROWIDs are now sequential.
- Do not allow dot-commands of the command-line shell to occur in the middle of a real SQL command.
- Modifications to the "lemon" parser generator so that the parser tables are 4 times smaller.
- Added support for user-defined functions implemented in C.
- Added support for new functions: coalesce(), lower(), upper(), and random()
- Added support for VIEWs.
- Added the subquery flattening optimizer.
- Modified the B-Tree and Pager modules so that disk pages that do not contain real data (free pages) are not journaled and are not written from memory back to the disk when they change. This does not impact database integrity, since the pages contain no real data, but it does make large INSERT operations about 2.5 times faster and large DELETEs about 5 times faster.
- Made the CACHE_SIZE pragma persistent
- Added the SYNCHRONOUS pragma
- Fixed a bug that was causing updates to fail inside of transactions when the database contained a temporary table.

### 2002 Feb 18 (2.3.3)

- Allow identifiers to be quoted in square brackets, for compatibility with MS-Access.
- Added support for sub-queries in the FROM clause of a SELECT.
- More efficient implementation of sqliteFileExists() under Windows. (by Joel Luscy)
- The VALUES clause of an INSERT can now contain expressions, including scalar SELECT clauses.
- Added support for CREATE TABLE AS SELECT
- Bug fix: Creating and dropping a table all within a single transaction was not working.

### 2002 Feb 14 (2.3.2)

- Bug fix: There was an incorrect assert() in pager.c. The real code was all correct (as far as is known) so everything should work OK if you compile with -DNDEBUG=1. When asserts are not disabled, there could be a fault.

### 2002 Feb 13 (2.3.1)

- Bug fix: An assertion was failing if "PRAGMA full_column_names=ON;" was set and you did a query that used a rowid, like this: "SELECT rowid, * FROM ...".

### 2002 Jan 30 (2.3.0)

- Fix a serious bug in the INSERT command which was causing data to go into the wrong columns if the data source was a SELECT and the INSERT clauses specified its columns in some order other than the default.
- Added the ability to resolve constraint conflicts is ways other than an abort and rollback. See the documentation on the "ON CONFLICT" clause for details.
- Temporary files are now automatically deleted by the operating system when closed. There are no more dangling temporary files on a program crash. (If the OS crashes, fsck will delete the file after reboot under Unix. I do not know what happens under Windows.)
- NOT NULL constraints are honored.
- The COPY command puts NULLs in columns whose data is '\N'.
- In the COPY command, backslash can now be used to escape a newline.
- Added the SANITY_CHECK pragma.

### 2002 Jan 28 (2.2.5)

- Important bug fix: the IN operator was not working if either the left-hand or right-hand side was derived from an INTEGER PRIMARY KEY.
- Do not escape the backslash '\' character in the output of the sqlite command-line access program.

### 2002 Jan 22 (2.2.4)

- The label to the right of an AS in the column list of a SELECT can now be used as part of an expression in the WHERE, ORDER BY, GROUP BY, and/or HAVING clauses.
- Fix a bug in the -separator command-line option to the sqlite command.
- Fix a problem with the sort order when comparing upper-case strings against characters greater than 'Z' but less than 'a'.
- Report an error if an ORDER BY or GROUP BY expression is constant.

### 2002 Jan 16 (2.2.3)

- Fix warning messages in VC++ 7.0. (Patches from nicolas352001)
- Make the library thread-safe. (The code is there and appears to work but has not been stressed.)
- Added the new sqlite_last_insert_rowid() API function.

### 2002 Jan 13 (2.2.2)

- Bug fix: An assertion was failing when a temporary table with an index had the same name as a permanent table created by a separate process.
- Bug fix: Updates to tables containing an INTEGER PRIMARY KEY and an index could fail.

### 2002 Jan 9 (2.2.1)

- Bug fix: An attempt to delete a single row of a table with a WHERE clause of "ROWID=x" when no such rowid exists was causing an error.
- Bug fix: Passing in a NULL as the 3rd parameter to sqlite_open() would sometimes cause a coredump.
- Bug fix: DROP TABLE followed by a CREATE TABLE with the same name all within a single transaction was causing a coredump.
- Makefile updates from A. Rottmann

### 2001 Dec 22 (2.2.0)

- Columns of type INTEGER PRIMARY KEY are actually used as the primary key in underlying B-Tree representation of the table.
- Several obscure, unrelated bugs were found and fixed while implemented the integer primary key change of the previous bullet.
- Added the ability to specify "*" as part of a larger column list in the result section of a SELECT statement. For example: "SELECT rowid, * FROM table1;".
- Updates to comments and documentation.

### 2001 Dec 14 (2.1.7)

- Fix a bug in CREATE TEMPORARY TABLE which was causing the table to be initially allocated in the main database file instead of in the separate temporary file. This bug could cause the library to suffer an assertion failure and it could cause "page leaks" in the main database file.
- Fix a bug in the b-tree subsystem that could sometimes cause the first row of a table to be repeated during a database scan.

### 2001 Dec 14 (2.1.6)

- Fix the locking mechanism yet again to prevent sqlite_exec() from returning SQLITE_PROTOCOL unnecessarily. This time the bug was a race condition in the locking code. This change effects both POSIX and Windows users.

### 2001 Dec 6 (2.1.5)

- Fix for another problem (unrelated to the one fixed in 2.1.4) that sometimes causes sqlite_exec() to return SQLITE_PROTOCOL unnecessarily. This time the bug was in the POSIX locking code and should not effect Windows users.

### 2001 Dec 4 (2.1.4)

- Sometimes sqlite_exec() would return SQLITE_PROTOCOL when it should have returned SQLITE_BUSY.
- The fix to the previous bug uncovered a deadlock which was also fixed.
- Add the ability to put a single .command in the second argument of the sqlite shell
- Updates to the FAQ

### 2001 Nov 23 (2.1.3)

- Fix the behavior of comparison operators (ex: "<", "==", etc.) so that they are consistent with the order of entries in an index.
- Correct handling of integers in SQL expressions that are larger than what can be represented by the machine integer.

### 2001 Nov 22 (2.1.2)

- Changes to support 64-bit architectures.
- Fix a bug in the locking protocol.
- Fix a bug that could (rarely) cause the database to become unreadable after a DROP TABLE due to corruption to the SQLITE_MASTER table.
- Change the code so that version 2.1.1 databases that were rendered unreadable by the above bug can be read by this version of the library even though the SQLITE_MASTER table is (slightly) corrupted.

### 2001 Nov 13 (2.1.1)

- Bug fix: Sometimes arbitrary strings were passed to the callback function when the actual value of a column was NULL.

### 2001 Nov 12 (2.1.0)

- Change the format of data records so that records up to 16MB in size can be stored.
- Change the format of indices to allow for better query optimization.
- Implement the "LIMIT ... OFFSET ..." clause on SELECT statements.

### 2001 Nov 3 (2.0.8)

- Made selected parameters in API functions const. This should be fully backwards compatible.
- Documentation updates
- Simplify the design of the VDBE by restricting the number of sorters and lists to 1. In practice, no more than one sorter and one list was ever used anyhow.

### 2001 Oct 21 (2.0.7)

- Any UTF-8 character or ISO8859 character can be used as part of an identifier.
- Patches from Christian Werner to improve ODBC compatibility and to fix a bug in the round() function.
- Plug some memory leaks that use to occur if malloc() failed. We have been and continue to be memory leak free as long as malloc() works.
- Changes to some test scripts so that they work on Windows in addition to Unix.

### 2001 Oct 19 (2.0.6)

- Added the EMPTY_RESULT_CALLBACKS pragma
- Support for UTF-8 and ISO8859 characters in column and table names.
- Bug fix: Compute correct table names with the FULL_COLUMN_NAMES pragma is turned on.

### 2001 Oct 14 (2.0.5)

- Added the COUNT_CHANGES pragma.
- Changes to the FULL_COLUMN_NAMES pragma to help out the ODBC driver.
- Bug fix: "SELECT count(*)" was returning NULL for empty tables. Now it returns 0.

### 2001 Oct 13 (2.0.4)

- Bug fix: an obscure and relatively harmless bug was causing one of the tests to fail when gcc optimizations are turned on. This release fixes the problem.

### 2001 Oct 13 (2.0.3)

- Bug fix: the sqlite_busy_timeout() function was delaying 1000 times too long before failing.
- Bug fix: an assertion was failing if the disk holding the database file became full or stopped accepting writes for some other reason. New tests were added to detect similar problems in the future.
- Added new operators: & (bitwise-and) | (bitwise-or), ~ (ones-complement), << (shift left), >> (shift right).
- Added new functions: round() and abs().

### 2001 Oct 9 (2.0.2)

- Fix two bugs in the locking protocol. (One was masking the other.)
- Removed some unused "#include " that were causing problems for VC++.
- Fixed sqlite.h so that it is usable from C++
- Added the FULL_COLUMN_NAMES pragma. When set to "ON", the names of columns are reported back as TABLE.COLUMN instead of just COLUMN.
- Added the TABLE_INFO() and INDEX_INFO() pragmas to help support the ODBC interface.
- Added support for TEMPORARY tables and indices.

### 2001 Oct 2 (2.0.1)

- Remove some C++ style comments from btree.c so that it will compile using compilers other than gcc.
- The ".dump" output from the shell does not work if there are embedded newlines anywhere in the data. This is an old bug that was carried forward from version 1.0. To fix it, the ".dump" output no longer uses the COPY command. It instead generates INSERT statements.
- Extend the expression syntax to support "expr NOT NULL" (with a space between the "NOT" and the "NULL") in addition to "expr NOTNULL" (with no space).

### 2001 Sep 28 (2.0.0)

- Automatically build binaries for Linux and Windows and put them on the website.

### 2001 Sep 28 (2.0-alpha-4)

- Incorporate makefile patches form A. Rottmann to use LIBTOOL

### 2001 Sep 27 (2.0-alpha-3)

- SQLite now honors the UNIQUE keyword in CREATE UNIQUE INDEX. Primary keys are required to be unique.
- File format changed back to what it was for alpha-1
- Fixes to the rollback and locking behavior

### 2001 Sep 20 (2.0-alpha-2)

- Initial release of version 2.0. The idea of renaming the library to "SQLus" was abandoned in favor of keeping the "SQLite" name and bumping the major version number.
- The pager and btree subsystems added back. They are now the only available backend.
- The Dbbe abstraction and the GDBM and memory drivers were removed.
- Copyright on all code was disclaimed. The library is now in the public domain.

### 2001 Jul 23 (1.0.32)

- Pager and btree subsystems removed. These will be used in a follow-on SQL server library named "SQLus".
- Add the ability to use quoted strings as table and column names in expressions.

### 2001 Apr 14 (1.0.31)

- Pager subsystem added but not yet used.
- More robust handling of out-of-memory errors.
- New tests added to the test suite.

### 2001 Apr 6 (1.0.30)

- Remove the sqlite_encoding TCL variable that was introduced in the previous version.
- Add options -encoding and -tcl-uses-utf to the sqlite TCL command.
- Add tests to make sure that tclsqlite was compiled using Tcl header files and libraries that match.

### 2001 Apr 5 (1.0.29)

- The library now assumes data is stored as UTF-8 if the --enable-utf8 option is given to configure. The default behavior is to assume iso8859-x, as it has always done. This only makes a difference for LIKE and GLOB operators and the LENGTH and SUBSTR functions.
- If the library is not configured for UTF-8 and the Tcl library is one of the newer ones that uses UTF-8 internally, then a conversion from UTF-8 to iso8859 and back again is done inside the TCL interface.

### 2001 Apr 4 (1.0.28)

- Added limited support for transactions. At this point, transactions will do table locking on the GDBM backend. There is no support (yet) for rollback or atomic commit.
- Added special column names ROWID, OID, and _ROWID_ that refer to the unique random integer key associated with every row of every table.
- Additional tests added to the regression suite to cover the new ROWID feature and the TCL interface bugs mentioned below.
- Changes to the "lemon" parser generator to help it work better when compiled using MSVC.
- Bug fixes in the TCL interface identified by Oleg Oleinick.

### 2001 Mar 20 (1.0.27)

- When doing DELETE and UPDATE, the library used to write the record numbers of records to be deleted or updated into a temporary file. This is changed so that the record numbers are held in memory.
- The DELETE command without a WHILE clause just removes the database files from the disk, rather than going through and deleting record by record.

### 2001 Mar 20 (1.0.26)

- A serious bug fixed on Windows. Windows users should upgrade. No impact to Unix.

### 2001 Mar 15 (1.0.25)

- Modify the test scripts to identify tests that depend on system load and processor speed and to warn the user that a failure of one of those (rare) tests does not necessarily mean the library is malfunctioning. No changes to code.

### 2001 Mar 14 (1.0.24)

- Fix a bug which was causing the UPDATE command to fail on systems where "malloc(0)" returns NULL. The problem does not appear Windows, Linux, or HPUX but does cause the library to fail on QNX.

### 2001 Feb 19 (1.0.23)

- An unrelated (and minor) bug from Mark Muranwski fixed. The algorithm for figuring out where to put temporary files for a "memory:" database was not working quite right.

### 2001 Feb 19 (1.0.22)

- The previous fix was not quite right. This one seems to work better.

### 2001 Feb 19 (1.0.21)

- The UPDATE statement was not working when the WHERE clause contained some terms that could be satisfied using indices and other terms that could not. Fixed.

### 2001 Feb 11 (1.0.20)

- Merge development changes into the main trunk. Future work toward using a BTree file structure will use a separate CVS source tree. This CVS tree will continue to support the GDBM version of SQLite only.

### 2001 Feb 6 (1.0.19)

- Fix a strange (but valid) C declaration that was causing problems for QNX. No logical changes.

### 2001 Jan 4 (1.0.18)

- Print the offending SQL statement when an error occurs.
- Do not require commas between constraints in CREATE TABLE statements.
- Added the "-echo" option to the shell.
- Changes to comments.

### 2000 Dec 10 (1.0.17)

- Rewrote sqlite_complete() to make it faster.
- Minor tweaks to other code to make it run a little faster.
- Added new tests for sqlite_complete() and for memory leaks.

### 2000 Dec 4 (1.0.16)

- Documentation updates. Mostly fixing of typos and spelling errors.

### 2000 Oct 23 (1.0.15)

- Documentation updates
- Some sanity checking code was removed from the inner loop of vdbe.c to help the library to run a little faster. The code is only removed if you compile with -DNDEBUG.

### 2000 Oct 19 (1.0.14)

- Added a "memory:" backend driver that stores its database in an in-memory hash table.

### 2000 Oct 18 (1.0.13)

- Break out the GDBM driver into a separate file in anticipation to added new drivers.
- Allow the name of a database to be prefixed by the driver type. For now, the only driver type is "gdbm:".

### 2000 Oct 16 (1.0.12)

- Fixed an off-by-one error that was causing a coredump in the '%q' format directive of the new sqlite_..._printf() routines.
- Added the sqlite_interrupt() interface.
- In the shell, sqlite_interrupt() is invoked when the user presses Control-C
- Fixed some instances where sqlite_exec() was returning the wrong error code.

### 2000 Oct 11 (1.0.10)

- Added notes on how to compile for Windows95/98.
- Removed a few variables that were not being used. Etc.

### 2000 Oct 8 (1.0.9)

- Added the sqlite_..._printf() interface routines.
- Modified the sqlite shell program to use the new interface routines.
- Modified the sqlite shell program to print the schema for the built-in SQLITE_MASTER table, if explicitly requested.

### 2000 Sep 30 (1.0.8)

- Begin writing documentation on the TCL interface.

### 2000 Sep 29 (Not Released)

- Added the sqlite_get_table() API
- Updated the documentation for due to the above change.
- Modified the sqlite shell to make use of the new sqlite_get_table() API in order to print a list of tables in multiple columns, similar to the way "ls" prints filenames.
- Modified the sqlite shell to print a semicolon at the end of each CREATE statement in the output of the ".schema" command.

### 2000 Sep 21 (Not Released)

- Change the tclsqlite "eval" method to return a list of results if no callback script is specified.
- Change tclsqlite.c to use the Tcl_Obj interface
- Add tclsqlite.c to the libsqlite.a library

### 2000 Sep 13 (Version 1.0.5)

- Changed the print format for floating point values from "%g" to "%.15g".
- Changed the comparison function so that numbers in exponential notation (ex: 1.234e+05) sort in numerical order.

### 2000 Aug 28 (Version 1.0.4)

- Added functions length() and substr().
- Fix a bug in the sqlite shell program that was causing a coredump when the output mode was "column" and the first row of data contained a NULL.

### 2000 Aug 22 (Version 1.0.3)

- In the sqlite shell, print the "Database opened READ ONLY" message to stderr instead of stdout.
- In the sqlite shell, now print the version number on initial startup.
- Add the sqlite_version[] string constant to the library
- Makefile updates
- Bug fix: incorrect VDBE code was being generated for the following circumstance: a query on an indexed table containing a WHERE clause with an IN operator that had a subquery on its right-hand side.

### 2000 Aug 18 (Version 1.0.1)

- Fix a bug in the configure script.
- Minor revisions to the website.

### 2000 Aug 17 (Version 1.0)

- Change the sqlite program so that it can read databases for which it lacks write permission. (It used to refuse all access if it could not write.)

### 2000 Aug 9

- Treat carriage returns as white space.

### 2000 Aug 8

- Added pattern matching to the ".table" command in the "sqlite" command shell.

### 2000 Aug 4

- Documentation updates
- Added "busy" and "timeout" methods to the Tcl interface

### 2000 Aug 3

- File format version number was being stored in sqlite_master.tcl multiple times. This was harmless, but unnecessary. It is now fixed.

### 2000 Aug 2

- The file format for indices was changed slightly in order to work around an inefficiency that can sometimes come up with GDBM when there are large indices having many entries with the same key. ** Incompatible Change **

### 2000 Aug 1

- The parser's stack was overflowing on a very long UPDATE statement. This is now fixed.

### 2000 July 31

- Finish the VDBE tutorial.
- Added documentation on compiling to WindowsNT.
- Fix a configuration program for WindowsNT.
- Fix a configuration problem for HPUX.

### 2000 July 29

- Better labels on column names of the result.

### 2000 July 28

- Added the sqlite_busy_handler() and sqlite_busy_timeout() interface.

### 2000 June 23

- Begin writing the VDBE tutorial.

### 2000 June 21

- Clean up comments and variable names. Changes to documentation. No functional changes to the code.

### 2000 June 19

- Column names in UPDATE statements were case sensitive. This mistake has now been fixed.

### 2000 June 16

- Added the concatenate string operator (||)

### 2000 June 12

- Added the fcnt() function to the SQL interpreter. The fcnt() function returns the number of database "Fetch" operations that have occurred. This function is designed for use in test scripts to verify that queries are efficient and appropriately optimized. Fcnt() has no other useful purpose, as far as I know.
- Added a bunch more tests that take advantage of the new fcnt() function. The new tests did not uncover any new problems.

### 2000 June 8

- Added lots of new test cases
- Fix a few bugs discovered while adding test cases
- Begin adding lots of new documentation

### 2000 June 6

- Added compound select operators: UNION, UNION ALL, INTERSECT, and EXCEPT
- Added support for using (SELECT ...) within expressions
- Added support for IN and BETWEEN operators
- Added support for GROUP BY and HAVING
- NULL values are now reported to the callback as a NULL pointer rather than an empty string.

### 2000 June 3

- Added support for default values on columns of a table.
- Improved test coverage. Fixed a few obscure bugs found by the improved tests.

### 2000 June 2

- All database files to be modified by an UPDATE, INSERT or DELETE are now locked before any changes are made to any files. This makes it safe (I think) to access the same database simultaneously from multiple processes.
- The code appears stable so we are now calling it "beta".

### 2000 June 1

- Better support for file locking so that two or more processes (or threads) can access the same database simultaneously. More work needed in this area, though.

### 2000 May 31

- Added support for aggregate functions (Ex: COUNT(*), MIN(...)) to the SELECT statement.
- Added support for SELECT DISTINCT ...

### 2000 May 30

- Added the LIKE operator.
- Added a GLOB operator: similar to LIKE but it uses Unix shell globbing wildcards instead of the '%' and '_' wildcards of SQL.
- Added the COPY command patterned after PostgreSQL so that SQLite can now read the output of the pg_dump database dump utility of PostgreSQL.
- Added a VACUUM command that that calls the gdbm_reorganize() function on the underlying database files.
- And many, many bug fixes...

### 2000 May 29

- Initial Public Release of Alpha code

This page last modified 2008/11/19 21:01:23 UTC