mysql 删掉重复数据

--不知道为啥这个mysql外边还要包一层，不然就报错
DELETE
FROMcourse  
WHEREname IN (
select mm.name from (SELECTa.name  as nameFROMcourse aGROUP BYa. NAMEHAVINGcount(a.NAME) > 1)mm)
AND  id NOT IN (
select nn.id from (SELECTmin(id) as idFROMcourse aGROUP BYa. NAMEHAVINGcount(a.NAME) > 1)nn
);