查询多张没关联的表的数据

1，查询多张没关联关系的表的数据

SELECT APPLY_UNIT FROM ((SELECT APPLY_UNIT FROM OFFICE_ROOM_APPLY WHERE STATE != 3 AND STATE != 5) UNION ALL (SELECT APPLY_UNIT FROM OFFICE_ROOM_RETURN WHERE STATE != 3 AND STATE != 5) UNION ALL (SELECT APPLY_UNIT FROM OFFICE_ROOM_SERVICE WHERE STATE != 3 AND STATE != 5))