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## SQLite Release 3.6.19 On 2009 Oct 14 (3.6.19)

- Added support for foreign key constraints. Foreign key constraints are disabled by default. Use the foreign_keys pragma to turn them on.
- Generalized the IS and IS NOT operators to take arbitrary expressions on their right-hand side.
- The TCL Interface has been enhanced to use the Non-Recursive Engine (NRE) interface to the TCL interpreter when linked against TCL 8.6 or later.
- Fix a bug introduced in 3.6.18 that can lead to a segfault when an attempt is made to write on a read-only database.

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.