December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2012 Unleashed
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Using Constraints
Constraints—including PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, and DEFAULT—are the primary method used to enforce data integrity. They are relatively easy to implement, and they constrain or limit the values that are allowed in SQL Server tables.