有如下資料表

假如我們要查詢ID為003的資料的所有子節點我們可以使用CTE 遞迴查詢完成...

if OBJECT_ID('tb','N') is not null
 drop table tb;


create table tb(id varchar(3) , pid varchar(3) , name varchar(10));
insert into tb values('001' , null , '廣東省');
insert into tb values('002' , '001' , '廣州市'); 
insert into tb values('003' , '001' , '深圳市') ;
insert into tb values('004' , '002' , '天河區') ;
insert into tb values('005' , '003' , '羅湖區');
insert into tb values('006' , '003' , '福田區') ;
insert into tb values('007' , '003' , '寶安區') ;
insert into tb values('008' , '007' , '西鄉鎮') ;
insert into tb values('009' , '007' , '龍華鎮');
insert into tb values('010' , '007' , '鬆崗鎮');

select * from tb;

 with cte as
 (
 select a.id,a.name,a.pid from tb a where id='003'
 union all 
 select k.id,k.name,k.pid  from tb k inner join cte c on c.id = k.pid
 )select * from cte