--树形表结构
create table TB_DEPT
(
  d_id         NUMBER not null,
  p_id         NUMBER,
  d_name       NVARCHAR2(64)
)
--以d_id=5941开始，向下查询出所有树型节点的数据
select d_id,p_id,d_name from tb_dept start with d_id=5941 connect by prior d_id=  p_id;