sqlserver实现取相同名称放在同一字段

  if object_id('[tbtest]') is not null drop table [tbtest]
  create table tbtest
  (
    A varchar(10) not null,
    B varchar(50) not null
  )
  go
  insert into tbtest
  select 'A',1 union all
  select'A',2 union all
  select'A',3 union all
  select'B',4 union all
  select'B',5 union all
  select'B',6 union all
  select'B',7 union all
  select'C',8 union all
  select'C',9 union all
  select'C',10 union all
  select'C',11
 
  go

  if object_id('[dbo].[functiontest]') is not null drop function [dbo].[functiontest]
  go

  create    function   functiontest()  
  returns   @tb   table(A   varchar(10),B   varchar(50))  
  AS
  begin 
  declare @a varchar(50)
  declare @b varchar(50)
  declare temp_cur cursor local for
  select * from tbtest
  open temp_cur
  fetch next from temp_cur into @a,@b
  while (@@fetch_status = 0)
  begin
   if(not exists(select * from @tb where A = @a))
      insert into @tb(A,B)values(@a,@b)
   else
    update @tb set B = B + ',' + @b where A = @a
   fetch next from temp_cur into @a,@b
  end
  return  
  end  
  go

  select * from functiontest()  
  go