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home / developersection / interviews / what is a constraint?
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Manish Kumar
Manish Kumar

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Manish Kumar
Manish Kumar 24 May 2017
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It can be used to specify the limit on the data type of table. Constraint in sql can be specified while creating or altering the table statement. Sample of constraint are.

  • NOT NULL.
  • CHECK.
  • DEFAULT.
  • UNIQUE.
  • PRIMARY KEY.
  • FOREIGN KEY.

 

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