create table #test
(
  id int not null,
  name nvarchar(100) null
)
insert into #test values(1,'张三')
insert into #test values(2,'李四')
insert into #test values(3,'王五')
declare @a nvarchar(50)
set @a='1,1,2,3'
select a.id,a.name from #test  a
left join f_split_dh(@a) b on a.id=b.a


drop table #test

--标值函数f_split_dh
Create function [dbo].[f_split_dh](@SourceSql varchar(8000))
returns @temp table(a varchar(100))
as 
begin
    declare @i int
    set @SourceSql=rtrim(ltrim(@SourceSql))
    set @i=charindex(',',@SourceSql)
    while @i>=1
    begin
        insert @temp values(left(@SourceSql,@i-1))
        set @SourceSql=substring(@SourceSql,@i+1,len(@SourceSql)-@i)
        set @i=charindex(',',@SourceSql)
    end
    if @SourceSql<>','
       insert @temp values(@SourceSql)
    return 
end

GO

--1    张三
--1    张三
--2    李四
--3    王五

------解决方案--------------------
SQL code

create table t1
(
    id int,
    name varchar(10)
)
insert into t1 values (1,'张三')
insert into t1 values (2,'李四')
insert into t1 values (3,'王五')
select * from t1

declare @str varchar(4000)='1,1,2,3'
create table #tt
(
    id int
)
set @str=REPLACE(@str,',',' union all select ')
set @str=' insert into #tt select '+@str
print @str
exec (@str)

select t1.name from #tt inner join t1 on #tt.id=t1.id

drop table #tt

--------------------
name
张三
张三
李四
王五