What are the Referential actions supported by FOREIGN KEY integrity constraint ?

UPDATE and DELETE Restrict - A referential integrity rule that disallows the update or deletion of referenced data.

DELETE Cascade - When a referenced row is deleted all associated dependent rows are deleted.

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bahwesh

  • Jul 17th, 2007
 

Foreign key value must exist as PK value on some other  table...

FK value can be null but PK can't

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