Home > Database, SQL Server > What are constraints?

What are constraints?

Constraints enable the RDBMS enforce the integrity of the database automatically, without needing you to create triggers, rule or defaults.

Types of constraints: NOT NULL, CHECK, UNIQUE, PRIMARY KEY, FOREIGN KEY

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Categories: Database, SQL Server
  1. floyd
    January 6, 2008 at 12:16 pm

    thats very useful definition i needed it …

  2. im not telling my name
    March 21, 2011 at 11:20 am

    thats nota very useful definition,
    I need it to explain it a bit more.

  3. im not telling my name
    March 21, 2011 at 11:20 am

    THATS GAY

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