如何实现这样表的选择????

[ahone]

表 A
id fid tid
1 12 5
2 22 12
3 24 22
4 26 null


如果输入tid=5

则输出:
id fid tid
1 12 5
2 22 12
3 24 22

就是根据fid和tid之间的关联选择结果,12继承自5,22又继承自12,24又继承自22 所有上面结果
请教sql的写法.
分不够会追加

[areswang]

你说的继承是个什么关系？

[昵称被占用了]

--写个函数
create function fn_Records(
@Tid int
)
returns @R table (Id int,fid int,tid int)
as
begin
  insert @r select Id,fid,tid from a where tid=@Tid
  while exists (select 1 from a where tid in (select fid from @r) and id not in (select id from @R))
     insert @r select Id,fid,tid from a where tid in (select fid from @r) and id not in (select id from @R)
  return
end
go

--调用
select * from dbo.fn_Records(5)

[ahone]

就是父子关系 "所有上面结果"---->"所以有上面结果"

[leo_lesley]

create table A (id  int, fid  int,tid int)
insert A
select 1        ,   12        ,   5       
union select 2     ,      22   ,        12 
union select 3      ,     24   ,        22 
union select 4      ,     26    ,null


declare @str varchar(1000),@fid varchar(100)
select @str=isnull(@str,'')+','+rtrim(id),@fid=isnull(@fid,'')+rtrim(fid) from A t where tid=5
while @@rowcount>0
begin
	 select @str=@str+','+rtrim(id),@fid=rtrim(fid) from A t where tid=@fid
end
select * from A where charindex(','+rtrim(id)+',',@str+',')>0

drop table A

[leo_lesley]

create table A (id  int, fid  int,tid int)
insert A
select 1        ,   12        ,   5       
union select 2     ,      22   ,        12 
union select 3      ,     24   ,        22 
union select 4      ,     26    ,null
go
create function f(@val int)
returns varchar(8000)
as
begin
	declare @str varchar(1000),@fid varchar(100)

	select @str=isnull(@str,'')+','+rtrim(id),@fid=isnull(@fid,'')+rtrim(fid) from A t where tid=@val
	while @@rowcount>0
	begin
		 select @str=@str+','+rtrim(id),@fid=rtrim(fid) from A t where tid=@fid
	end
	set @str=@str+','
	return @str
end
go
select * from A where charindex(','+rtrim(id)+',',dbo.f(5))>0

drop function f
drop table A


/*  结果
id          fid         tid         
----------- ----------- ----------- 
1           12          5
2           22          12
3           24          22

（所影响的行数为 3 行）
*/