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SQL code:

--Éú³É²âÊÔÊý¾Ý
create table BOM(ID INT,PID INT,MSG VARCHAR(1000))
insert into BOM select 1,0,NULL
insert into BOM select 2,1,NULL
insert into BOM select 3,1,NULL
insert into BOM select 4,2,NULL
insert into BOM select 5,3,NULL
insert into BOM select 6,5,NULL
insert into BOM select 7,6,NULL
go

--´´½¨Óû§¶¨Ò庯ÊýÓÃÓÚȡÿ¸ö¸¸½ÚµãÏÂ×Ó½ÚµãµÄ²É¹ºÅäÖÃÐÅÏ¢
create function f_getChild(@ID VARCHAR(10))
returns @t table(ID VARCHAR(10),PID VARCHAR(10),Level INT)
as
begin
declare @i int
set @i = 1
insert into @t select ID,PID,@i from BOM where PID = @ID

while @@rowcount<>0
begin
set @i = @i + 1

insert into @t
select
a.ID,a.PID,@i
from
BOM a,@t b
where
a.PID=b.ID and b.Level = @i-1
end
return
end
go

--Ö´Ðвéѯ
select ID from dbo.f_getChild(3)
go

--Êä³ö½á¹û
/*
ID
----
5
6
7
*/

--ɾ³ý²âÊÔÊý¾Ý
drop function f_getChild
drop table BOM



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