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## SQLite Release 3.3.16 On 2007-04-18

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

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.