Mysql 多个字段查找重复数

delete FROM `test_table` WHERE id in (SELECT id,concat(user_id,user_id2) as __f
FROM `test_table` where user_id = 11
GROUP BY `__f`
HAVING COUNT( * ) >1) and id not in (SELECT min(id),concat(user_id,user_id2) as __f
FROM `test_table` where user_id = 11
GROUP BY `__f`
HAVING COUNT( * ) >1)

select id,user_id from test_table where user_id = 11 and id not in (SELECT id,concat(user_id,user_id2) as __f
FROM `test_table` where user_id = 11
GROUP BY `__f`
HAVING COUNT( * ) >1) __tmp

delete FROM `test_table` WHERE user_id = 11 and id not in (select id from (SELECT id,concat(user_id,user_id2) as __f
FROM `test_table` where user_id = 11
GROUP BY `__f`
HAVING COUNT( * ) >1) __tmp)