单个字段 先分组，判断出重复的数据 取最大或者最小的ID 然后子表关联删除， 手动删除，可多次
DELETE
FROM
t_tableName e
WHERE e.id IN (
SELECT b.id FROM
(SELECT max(id) as ID , SpdManufacturerCode ,COUNT(1) as counts FROM `t_tableName` GROUP BY SpdManufacturerCode HAVING counts>1 )
as b WHERE e.SpdManufacturerCode = b.SpdManufacturerCode AND e.ID =b.ID AND e.SpdId is NOT NULL
)
多个字段 就分组遍
DELETE
FROM
t_tableName e
WHERE e.id IN (
SELECT b.id FROM
(SELECT min(id) as ID , supplierid,productagencyid ,COUNT(1) as counts FROM `t_tableName` GROUP BY supplierid,productagencyid HAVING counts>1 )
as b WHERE e.supplierid = b.supplierid AND e.productagencyid = b.productagencyid AND e.ID =b.ID
)
