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## SQLite Release 3.5.4 On 2007-12-14

1. 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.
2. 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.)
3. The VACUUM command preserves the setting of the legacy_file_format pragma. (Ticket #2804.)
4. Productize and officially support the group_concat() SQL function.
5. Better optimization of some IN operator expressions.
6. Add the ability to change the auto_vacuum status of a database by setting the auto_vaccum pragma and VACUUMing the database.
7. Prefix search in FTS3 is much more efficient.
8. 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.
9. Other small bug fixes and optimizations.

A complete list of SQLite releases in a single page and a chronology are both also available. A detailed history of every check-in is available at SQLite version control site.