Thank you all for the replies! On Wed, Mar 9, 2011 at 7:01 PM, David Johnston <pol...@yahoo.com> wrote: > SELECT username, count(username) FROM phpbb_users > GROUP BY username > HAVING count(username) > 1; > > If anything shows up then (phpbb_users .username) is not a unique field but > you are trying to insert it into one that is (drupal_users.uid) >
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