SQL SERVER 进行递归查询

有如下数据表

假如我们要查询ID为003的数据的所有子节点我们可以使用CTE 递归查询完成...

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 , ‘广东省‘);
insert into tb values(‘002‘ , ‘001‘ , ‘广州市‘); 
insert into tb values(‘003‘ , ‘001‘ , ‘深圳市‘) ;
insert into tb values(‘004‘ , ‘002‘ , ‘天河区‘) ;
insert into tb values(‘005‘ , ‘003‘ , ‘罗湖区‘);
insert into tb values(‘006‘ , ‘003‘ , ‘福田区‘) ;
insert into tb values(‘007‘ , ‘003‘ , ‘宝安区‘) ;
insert into tb values(‘008‘ , ‘007‘ , ‘西乡镇‘) ;
insert into tb values(‘009‘ , ‘007‘ , ‘龙华镇‘);
insert into tb values(‘010‘ , ‘007‘ , ‘松岗镇‘);

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
 

查询结果如下：
003 深圳市 001
005 罗湖区 003
006 福田区 003
007 宝安区 003
008 西乡镇 007
009 龙华镇 007
010 松岗镇 007