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