table constraint on two columns

From: ldrlj1 <russelljanusz(at)yahoo(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: table constraint on two columns
Date: 2013-07-22 14:05:21
Message-ID: 1374501921767-5764645.post@n5.nabble.com
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Postgres 9.2.4.

I have two columns, approved and comments. Approved is a boolean with no
default value and comments is a character varying (255) and nullable.

I am trying to create a constraint that will not allow a row to be entered
if approved is set to false and comments is null.

This does not work. yada, yada, yada... add constraint "chk_comments' check
(approved = false and comments is not null). The constraint is successfully
added, but does not work as I expected.

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