( 转）mysql中删除两条重复记录中的一条

| id | createTime | labId | pubId |
+—–+———————+——-+————————————–+
| 171 | 2014-05-22 21:49:11 | 1 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 172 | 2014-05-22 21:49:11 | 2 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 173 | 2014-05-22 21:49:11 | 6 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 174 | 2014-05-22 21:49:11 | 5 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 175 | 2014-05-22 21:49:11 | 2 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 176 | 2014-05-22 21:49:11 | 6 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 177 | 2014-05-22 21:49:11 | 5 | d4165953-2245-4b8c-b21d-8c08d519f66e |
| 178 | 2014-07-03 15:20:07 | 2 | d5308254-3b52-4ada-8e10-16b6a764c5e5 |
| 179 | 2014-07-03 15:36:00 | 2 | d4bc80b4-b57b-4049-9ab3-8f45102fae91 |
| 180 | 2014-07-04 21:05:26 | 4 | f8ccee8f-d93c-41cc-8d2f-28ada7ea4b07 |
我需要把labId和pubId相同的重复记录删掉，只要labId和pubId有一项不同就不算重复记录。
delete from t_publishandlabel where id not in ( select * from(select id from t_publishandlabel group by pubId,labId)b);