In PostgreSQL you can do it like this: 

SELECT path, mds.md5
FROM 
    ( SELECT md5, COUNT(*) AS cnt
      FROM files GROUP BY md5) AS mds
    LEFT JOIN files ON files.md5=mds.md5
WHERE mds.cnt > 1

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In reply to Re: Dumb SQL Question by zwon
in thread Dumb SQL Question by pileofrogs

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