DELETe FROM comments c1WHERe EXISTS ( SELECt * FROM comments c2 WHERe c2.id <> c1.id AND c2.name = c1.name AND c2.email = c1.email AND c2.comment = c1.comment)AND c1.id <> ( SELECt MIN(c2.id) FROM comments c2 WHERe c2.name = c1.name AND c2.email = c1.email AND c2.comment = c1.comment)
