思路
先查询出满足某种条件的数据的最小ID,然后删除最小ID以外的数据就实现了去重
实例
查询最小ID的重复数据
select * from oms_relation_model orm where orm.fd_id= ( select min(t.fd_id) from oms_relation_model t where orm.fd_ekp_id=t.fd_ekp_id and orm.fd_ekp_id=t.fd_ekp_id ) ;
删除操作
delete from oms_relation_model s where s.fd_id not in ( select orm.fd_id from oms_relation_model orm where orm.fd_id= ( select min(t.fd_id) from oms_relation_model t where orm.fd_ekp_id=t.fd_ekp_id and orm.fd_ekp_id=t.fd_ekp_id ) );