Some DDL and example rows please.

-----Original Message-----
From: owner-informix-list@iiug.org [mailtowner-informix-list@iiug.org] On Behalf Of Zev Berezin
Sent: Wednesday, August 03, 2005 2:18 PM
To: informix-list@iiug.org
Subject: constraint to allow multiple nulls

Hi All,

I have a column that can only have one 'Y' value
and multiple NULL values. An unique constraint allows one null value
and a PK allows none. Is there any constraint that would
enforce this?

Tech Spec: IDS 7.31.FD7

TIA,
Zev Berezin
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