create table t
(bid int, p_bid int)
insert into t
select 1, null union all
select 2, 1 union all
select 3, 1 union all
select 4, 3 union all
select 5, 4 union all
select 6, 5 union all
select 7, 1 union all
select 8, 2
create function dbo.aa(@parent int)
returns @t table(p_bid int,bid int,level int)
asbegin
declare @level int
set @level=1
insert into @t
select p_bid,bid,@level from t where p_bid=@parent
while @@rowcount>0
begin
set @level=@level+1
insert into @t
select a.p_bid,a.bid,@level
from t a,@t b
where a.p_bid=b.bid
and b.level=@level-1
endreturn
endgo
select space(level*5)+cast(bid as varchar),* from dbo.aa(1)
----------------------
with
showtree(
id) as
(
select
id from
dbo.
clients where
id=8
union all
select
clients.
id from
showtreeass
inner
join
clients on
s.id =
clients.
parent_id
)select
distinct
(id)
from
showtree
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