SQL CTE 递归 查询省，市，区

 IF OBJECT_ID('tb') 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')

GO

SELECT * FROM tb AS t



DECLARE @ID VARCHAR(3) 

--查询ID = '001'的所有子节点

SET @ID = '007'

;WITH Temp AS (

  SELECT id,pid,NAME FROM tb AS t WHERE t.id=@ID

  UNION ALL

  SELECT t2.id,t2.pid,t2.NAME FROM tb t2 INNER JOIN Temp tm on t2.pid=tm.ID

)

SELECT * FROM Temp AS t WHERE id!=@ID