What is FOREIGN KEY?

What is FOREIGN KEY?

A FOREIGN KEY is classically a type of primary key it is the normal key for he one table but it is can become a primary key for the other table, The foreign key constraints are using a referential integrity, The foreign key constraints are mainly signifies a referential integrity constraint prevents any actions that can be destroy links between tables with the corresponding data values. Its prevent actions that would leave rows with foreign key values when there are no primary keys with that value.

By:UMANG
Date:2012-01-09 00:00:00

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