For some odd reason, I have it stuck in my mind that you need to use JOINS to find duplicates (maybe it was something that Access made you do way back in the day). I know there is SOMETHING out there that seems like it would be very easy to do in SQL but in fact involves duplicating the table in an alias. But finding duplicates isn't it.
SELECT username,
COUNT(username) AS NumberOfOccurences
FROM users
GROUP BY username
HAVING ( COUNT(username) > 1 )
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