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Re: Help with SQL constraint

From: DA Morgan <damorgan_at_psoug.org>
Date: Wed, 14 Feb 2007 18:54:20 -0800
Message-ID: <1171508057.694081@bubbleator.drizzle.com>


dean wrote:
> Hello all,
>
> A table T has 2 fields, one (L) holding letters 'Y' and 'N', and one
> (X) holding numbers. Is there a (non trigger) constraint such that for
> L='N' (and only this letter) the numbers must be unique? Records
> where L='Y' do not have to be unique.
>
> (I need to join another table to the L='N' group of records, and the
> join must be key-preserved).
>
> Cheers,
>
> Dean

What version of Oracle and what's wrong with a trigger?

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org
Received on Wed Feb 14 2007 - 20:54:20 CST

Original text of this message

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