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Date: Sat, 19 Nov 2005 08:31:20 -0600
From: Bruno Wolff III <bruno@wolff.to>
To: Jeremy Palmer <palmerj@xtra.co.nz>
Cc: pgsql-sql@postgresql.org, 'Michael Glaesemann' <grzm@myrealbox.com>
Subject: Re: DISTINCT ON
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On Sat, Nov 19, 2005 at 17:06:27 +1300,
  Jeremy Palmer <palmerj@xtra.co.nz> wrote:
> 
> Interesting enough, on my server the "distinct on" clause that I originally
> ran takes 10% of execution time that the query you provided does.

If DISTINCT ON wasn't useful, I doubt it would have been added.