[求助]一个复杂的视图查询问题

if object_id('test') is not null
drop table test
go
create table test(id int,cname char(1),job char(1))
insert into test select 1,'a','b'
union all select 1,'a','c'
union all select 2,'q','e'
go
select * from test
if object_id('dbo.fn') is not null
drop function dbo.fn
go
create function dbo.fn(@id int ,@cname char(1))
returns varchar(10)
as
begin
declare @t varchar(10)
select @t=' '
select @t=@t+job+',' from test where id=@id and cname=@cname
return left(@t,len(@t)-1)
end
go

select distinct id,cname,dbo.fn(id,cname) as job from test