SQLSERVER 2005 递归查询 .

项目中有用户组表UserGroup如下：

其中PID表示当前组的上级组

表数据如下：

现在想查询出顶级组[没有上级组叫顶级组]A1组的所有子孙组ID,SQL如下：

--查询子节点
 with
     RTD1 as(
         select id ,pid from UserGroup
    ),
     RTD2 as(
         select * from RTD1 where id=6
         union all
         select RTD1.* from RTD2 inner join RTD1
         on RTD2.id=RTD1.PID
    )
 select * from RTD2

--查询子节点
with 
	RTD1 as(
		select id ,pid from UserGroup
	),
	RTD2 as(
		select * from RTD1 where id=6
		union all
		select RTD1.* from RTD2 inner join RTD1 
		on RTD2.id=RTD1.PID
	)
select * from RTD2

查询结果如下：

id          pid
----------- -----------
6           NULL
17          6
18          6
20          6
21          20
22          20
23          20
24          20
29          20
25          23
26          23
28          26
27          25

(13 行受影响)

 

现在想查询出A1-B3-C3-D2组的所有上级组ID,SQL如下：

--查询父节点
 with
     RTU1 as(
         select id ,pid from UserGroup
    ),
     RTU2 as(
         select * from RTU1 where id=26
         union all
         select RTU1.* from RTU2 inner join RTU1
         --on myT2.id=myT.PID
         on RTU2.PID=RTU1.ID
    )
 select * from RTU2

--查询父节点
with 
	RTU1 as(
		select id ,pid from UserGroup
	),
	RTU2 as(
		select * from RTU1 where id=26
		union all
		select RTU1.* from RTU2 inner join RTU1 
		--on myT2.id=myT.PID
		on RTU2.PID=RTU1.ID
	)
select * from RTU2

查询结果如下：

id          pid
----------- -----------
26          23
23          20
20          6
6           NULL

(4 行受影响)

 

 

 

 

 

==================================================================

 

--查询某一父节点的所有子节点
with
 RTD1 as(
  select id,name,fid from ProductType
 ),
 RTD2 as(
  select id,name,fid from RTD1 where id=10103
  union all
  select RTD1.* from RTD2 inner join RTD1
  on RTD2.id=RTD1.FID
 )
select * from RTD2

 

 

--查询某一父节点的所有子节点
with c as (
     select * from producTtype where Id =10103
  union all
    select a.* from producTtype as a
        join c on a.fid = c.Id)
 select * FROM  c