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## SQLite Release 3.3.16 On 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.

A complete list of SQLite releases in a single page is also available. A detailed history of every check-in is available at http://www.sqlite.org/src/timeline.