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Why we use Primary Key

edited Apr 29, 2009 3:52AM in Database Administration (MOSC) 4 commentsAnswered
Hi,
As I know " Primary Key = Unique Key + Not Null "  , then why we use Primary key instead of Unique Key + Not Null.

I know One difference i.e.

Primary key creates the Clustered index but unique key creates the Non clustered index.
Is there any other difference .

Thanks

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