Check constraint: Difference between revisions

Revision as of 02:23, 31 August 2006

Revision as of 08:50, 17 September 2006

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{{linkless-date|July 2006}}

A '''check constraint''' is a rule that defines valid [[data]] when adding or updating an entry in a [[database]]. A check constraint is applied to a column in the database. The constraint must be a [[Boolean expression]].