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Re: Unique constraint and NULL values

From: Dave <slimdave_at_yahoo.com>
Date: 22 Oct 2004 12:23:06 -0700
Message-ID: <c502cdfc.0410221123.4e07df91@posting.google.com> 





If you want to get around this, then use a function-based index to
avoid including in a unique index any rows where either of the columns
is null.



One method would be ...


[code]



Create unique index my_ind


on my_tab (Decode(col2,Null,Null,col1),Decode(col1,Null,Null,col2))


[/code]

Received on Fri Oct 22 2004 - 14:23:06 CDT












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