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doctrine2/manual/new/docs/en/_old-docs/Schema reference - Foreign keys - Introduction.php
jepso 5329c3827c * Converted most of the docs to the new format.
* Fixed a few layout bugs in new documentation
* Fixed documentation table of contents indentation bug in IE6 (fixes #344)
* Fixed a parser bug in Sensei_Doc_Section
* Restructrured a bit some files of the documentation.
2007-06-13 21:30:32 +00:00

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PHP

A foreign key constraint specifies that the values in a column (or a group of columns) must match the values appearing in some row of another table.
In other words foreign key constraints maintain the referential integrity between two related tables.