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From: Josh Berkus <josh@agliodbs.com>
Reply-To: josh@agliodbs.com
Organization: Aglio Database Solutions
To: pgsql-sql@postgresql.org
Subject: COUNT DISTINCT?
Date: Tue, 30 Jul 2002 14:27:18 -0700
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Folks,

Anybody know a keen shortcut for the following:

SELECT count(skip_date)=20
FROM (SELECT DISTINCT skip_date FROM weekend_list
		WHERE ... ...) days_to_skip;

That's a double aggregate, and is bound to be dog-slow.

--=20
-Josh Berkus
 Aglio Database Solutions
 San Francisco