create table cte(
id int identity(1,1),
now int, --本级别
up int ) --上一级别
insert into cte
select 0,null
union all select 1,0
union all select 2,0
union all select 3,0
union all select 4,1
union all select 5,2
union all select 6,3
union all select 7,4
select * from cte 得到原始数据:
id now up
----------- ----------- -----------
1 0 NULL
2 1 0
3 2 0
4 3 0
5 4 1
6 5 2
7 6 3
8 7 4
--选出隶属于1级别的所以级别:
with DiGui as
(select * from cte where now=1 --定位点成员
union all --递归成员 通过引用cte与原表join实现
select cte.* from cte,DiGui where cte.up=DiGui.now
)
select * from DiGui
id now up
----------- ----------- -----------
2 1 0
5 4 1
8 7 4
--选出1级别的所以上级级别:
with DiGui as
(select * from cte where now=1 --定位点成员
union all
select cte.* from cte,DiGui where cte.now=DiGui.up
)
select * from DiGui
id now up
----------- ----------- -----------
2 1 0
1 0 NULL