UNIQUE Constraints in SQL (SQL Server)
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Published on 2010-04-12T17:11:49Z
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sql-server-2005
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Why are UNIQUE Constraints needed in database ?
Can you provide any examples ?
Primary Key is UNIQUE by default... Understandable as they are referred in other tables as Foreign keys... relation is needed to connect them for rdbms platform...
but why would one refer to other columns as UNIQUE, what is benefit of doing so ?)
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