SQL Tutorial - Table Constraint

Hosted by Dailymotion. For legal issues report at the Copyright Center, report us on DMC, or use the Instant Removal tool.

SQL Tutorial - Table Constraint

1
1keydata

14 Views • May 06, 2013

Description

In a relational database, one can place constraints on what value can be entered into a table. This tutorial discusses four of the constraints and how they are implemented in SQL: NOT NULL, DEFAULT, UNIQUE, and CHECK.