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From: Nathan Mailg <nathanmailg@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: removing duplicates and using sort
Date: Tue, 17 Sep 2013 12:03:15 -0400
Message-ID: <309ABE98-2643-4E6B-B5C9-FF68271B9661@gmail.com> (raw)
In-Reply-To: <1379342569452-5771096.post@n5.nabble.com>
References: <CAN8Rhd2n84Yxd4QP0SXuyuO+K4f3scQnAYAwq53GDFojOSkAjw@mail.gmail.com>
	<1379342569452-5771096.post@n5.nabble.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>

Yes, that's correct, modifying the original ORDER BY gives:

ORDER BY lastname, firstname, refid, appldate DESC;
ERROR:  SELECT DISTINCT ON expressions must match initial ORDER BY expressions

Using WITH works great:

WITH distinct_query AS (
    SELECT DISTINCT ON (refid) id, refid, lastname, firstname, appldate
        FROM appl WHERE lastname ILIKE 'Williamson%' AND firstname ILIKE 'd%'
        GROUP BY refid, id, lastname, firstname, appldate
        ORDER BY refid, appldate DESC
    )
SELECT * FROM distinct_query ORDER BY lastname, firstname;

Thank you!



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