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SELECT * FROM `member` a join (SELECT password, count(password) as pw_count FROM `member` group by password HAVING COUNT(password) > 1) b on b.password = a.password |
Find members that have the same password
More Advanced – Get minimum member ID from members that have same password:
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SELECT min(a.id) as m_id, b.pw_count FROM `member` a join (SELECT password, count(password) as pw_count FROM `member` group by password HAVING COUNT(password) > 1) b on b.password = a.password group by b.pw_count |
Reference: