Oh ok, found it: # select one.username, one.user_id, two.user_id from phpbb_users one, phpbb_users two where two.username=one.username and two.user_id <> one.user_id; username | user_id | user_id ----------+---------+--------- Вячеслав | 7564 | 421 Вячеслав | 421 | 7564 (2 rows)
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