Thursday, 6 January 2011

What is FOREIGN KEY?


A FOREIGN KEY constraint prevents any actions that would destroy links between tables with the corresponding data values. A foreign key in one table points to a primary key in another table. Foreign keys prevent actions that would leave rows with foreign key values when there are no primary keys with that value. The foreign key constraints are used to enforce referential integrity.

 Share This Post


Friendly Learn Translate to Tamil

Smilely

Services

© 2014