父子关系法展开
select ljbh,sub_ljbh from lqead061a start with ljbh ='p13' connect by prior sub_ljbh = ljbh --sub
select ljbh,sub_ljbh from lqead061a start with sub_ljbh ='p13' connect by prior ljbh = sub_ljbh --marster
select ljbh,sub_ljbh from lqead061a start with sub_ljbh ='p13' connect by prior ljbh = sub_ljbh --marster