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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Entity Integrity
Entity integrity requires that all rows in a table be unique. You can enforce entity integrity in SQL Server by using PRIMARY KEY constraints, UNIQUE constraints, and IDENTITY properties.