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Conditional Uniqueness

edited Dec 21, 2013 12:27AM in SQL Language (MOSC) 7 commentsAnswered
Oracle® Database SQL Language Reference
11g Release 2 (11.2)
E41084-02

"Function-based unique indexes can be useful in defining a conditional unique constraint on a column or

combination of columns."

A)  Which version did this ability first appear in using this syntax?

  In that version, why was this ability created?

C)  Is this ability in compliance with an Ansi standard?  If so which one?

D) Are there known performance issues with using this ability?

Chris Brown

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