mysql, count attachment rows each user.
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            by Nighthawk
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        Published on 2010-03-28T10:39:23Z
        Indexed on 
            2010/03/28
            10:43 UTC
        
        
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mysql-query
SELECT
u.userid, u.username,
(SELECT count(*) FROM attachment as a WHERE a.userid=u.userid) as amount
FROM
user
WHERE
AND u.usergroupid=10
ORDER BY amount DESC
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