如題：
有person表
+----+---------+
| id | email |
+----+---------+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] |
+----+---------+
連線
delete p1
from
person p1,
person p2
where
p1.email = p2.email
and p1.id > p2.id
delete
from
person
where
id not in ( select id from ( select min( id ) as id from person group by email ) as m );
delete
from
person
where
id not in ( select min( id ) as id from person group by email );
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