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From: Josh Berkus <josh@agliodbs.com>
Organization: Aglio Database Solutions
To: Rudi Starcevic <rudi@oasis.net.au>, pgsql-sql@postgresql.org
Subject: Re: Count equals 0
Date: Tue, 18 Mar 2003 08:35:30 -0800
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Rudi,

> What I would like to see is something like:
>
> site a : 0
> site b : 3
> site c : 6
>
> I've tries Left outer join's with and without coalesce without joy so far.
> Please check out my query.

You're going to need to nest your query:

SELECT um2.site_name, COALESCE(count_um.total, 0) as total
FROM user_main um2 LEFT OUTER JOIN
     (SELECT    um.site_name, count(um.cus_id) AS total
     FROM    user_main um
     WHERE    NOT EXISTS
             (
             SELECT    cus_id
             FROM    user_sys_messages usm
             WHERE    usm.cus_id = um.cus_id
            ) 
     GROUP BY um.site_name) count_um 
		ON um2.site_name = count_um.site_name
ORDER BY um2.site_name


-- 
Josh Berkus
Aglio Database Solutions
San Francisco