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unique constraint and nulls

From: Chris Seidel <cseidel_at_arcor.de>
Date: Thu, 25 May 2006 23:44:13 +0200
Message-ID: <4476252d$0$4493$9b4e6d93@newsread2.arcor-online.net> 





Hallo,



I need a unique constraint over 2 columns. OK, no problem.



But it must ignore rows where column 1 has a null value.



Is this possible with a constraint? Or do I have to use a trigger?



Thank you. 
Received on Thu May 25 2006 - 16:44:13 CDT












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