sql 删除重复数据

DELETE a FROM tbBuilding a WHERE EXISTS (SELECT 1 FROM tbBuilding b WHERE b.Province = a.Province AND b.City = a.City AND b.County = a.County AND b.Street = a.Street AND b.Road = a.Road AND b.BuildingGroup = a.BuildingGroup AND b.Building = a.Building AND b.BuildingId < a.BuildingId)