[djbaxter]

SELECT ipaddress, GROUP_CONCAT(DISTINCT userid) AS userid, GROUP_CONCAT(DISTINCT postid) AS postid
FROM post
WHERE dateline > 1335925435 AND userid > 0 AND ipaddress != ''
GROUP BY ipaddress
HAVING COUNT(DISTINCT userid) > 1
ORDER BY COUNT(DISTINCT userid) DESC
LIMIT 500;

Result: MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0026 sec )

SELECT ipaddress, GROUP_CONCAT(DISTINCT userid) AS userid
FROM user
WHERE joindate > 1333938235 AND userid > 0 AND ipaddress != ''
GROUP BY ipaddress
HAVING COUNT(DISTINCT userid) > 1
ORDER BY COUNT(DISTINCT userid) DESC
LIMIT 500;

Result: MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0030 sec )