oracle 删除表里重复数据

DELETE  FROM  assembly_supply_chain     a 　　WHERE a.supply_chain_id> (

SELECT min(b.supply_chain_id ) 　　FROM assembly_supply_chain  b 　　

WHERE  a.mtl_item_code=b.mtl_item_code   and a.subinventory_code=b.subinventory_code and a.production_line_code=b.production_line_code

and a.bh_type=b.bh_type and a.store_house_code=b.store_house_code and a.wip_supply_type=b.wip_supply_type 

);

DELETE  FROM  MTL_LOGICAL_ZONE   a 　　WHERE a.id > (

SELECT min(b.id) 　　FROM MTL_LOGICAL_ZONE b 　　

WHERE  b.mtl_item_id=a.mtl_item_id   and a.logical_zone_id=b.logical_zone_id

);

/*****物料组***************/

DELETE  FROM  mtl_group_ref     a 　　WHERE a.id> (

SELECT min(b.id ) 　　FROM mtl_group_ref  b 　　

WHERE  a.mtl_item_id=b.mtl_item_id   and a.mtl_category_id=b.mtl_category_id --and a.subinv_code=b.subinv_code

);

DELETE  FROM  MTL_LOGICAL_ZONE     a 　　WHERE a.id> (

SELECT min(b.id ) 　　FROM MTL_LOGICAL_ZONE  b 　　

WHERE  a.mtl_item_id=b.mtl_item_id   and a.logical_zone_id=b.logical_zone_id 

);