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create table table1(AID int,NAME nvarchar(20))
create table table2 (BID int,NUMBER nvarchar(20))
insert into table1 select 1,'Tom' union all
select 2,'Jim'
insert into table2 select 1,20 union all
select 1,30
--º¯Êý
create function F_Str(@ID int)
returns nvarchar(100)
as
begin
   
    declare @S nvarchar(100)
    select return @S=isnull(@S+',','')+NUMBER from table2 where BID=@ID
   return @S
end
--²éѯ
select NAME,NUMBER = dbo.F_Str(AID) from table1
--½á¹û
-------------------
Tom    20,30
Jim    NULL


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