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From: David Johnston <polobo@yahoo.com>
To: pgsql-sql@postgresql.org
Subject: Re: removing duplicates and using sort
Date: Mon, 16 Sep 2013 07:42:49 -0700 (PDT)
Message-ID: <1379342569452-5771096.post@n5.nabble.com> (raw)
In-Reply-To: <CAN8Rhd2n84Yxd4QP0SXuyuO+K4f3scQnAYAwq53GDFojOSkAjw@mail.gmail.com>
References: <CAN8Rhd2n84Yxd4QP0SXuyuO+K4f3scQnAYAwq53GDFojOSkAjw@mail.gmail.com>
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Note that you could always do something like:

WITH original_query AS (
SELECT DISTINCT ...
)
SELECT *
FROM original_query
ORDER BY lastname, firstname;

OR

SELECT * FROM (
    SELECT DISTINCT ....
) sub_query
ORDER BY lastname, firstname

I am thinking you cannot alter the existing ORDER BY otherwise your use of
"DISTINCT ON" begins to mal-function.  I dislike DISTINCT ON generally but
do not wish to ponder how you can avoid it, so I'd suggest just turning your
query into a sub-query like I show above.

David J.




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