Sunday, 9 October 2011

SQL Constraints

nConstraints are used to limit the type of data that can go into a table.
nConstraints can be specified when a table is created or after the table is created.
üNOT NULL
üUNIQUE
üPRIMARY KEY
üFOREIGN KEY
üCHECK
üDEFAULT
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