这个查询为何不返回结果，只返回受影响的行数

USE [1112b]
GO
declare @in_kemu nvarchar(10)
set @in_kemu = '语文'





--这个大段是生成临时表
declare @QueryString nvarchar(500)

declare @kemu nvarchar(10)


set @kemu =@in_kemu  --设置需传入动态语句的参数的值为@kemu


set @QueryString ='SELECT '+@kemu+' as 科目, 
    [ROW_NUMBER] = ROW_NUMBER() OVER(ORDER BY '+@kemu+' DESC),
    [DENSE_RANK] = DENSE_RANK() OVER(ORDER BY '+@kemu+' DESC), 
    [PERCENT] = (ROW_NUMBER() OVER(ORDER BY '+@kemu+' DESC))*1./(SELECT COUNT(1) FROM scores_xx where 年级 ='+'1'+')
  into #biaozhunfen
  FROM scores_xx
  where 年级 = '+'1'

exec (@QueryString) --请注意参数的顺序

--生成临时表结束

--在临时表中执行查询
declare @QueryString2 nvarchar(500)

declare @kemu2 nvarchar(10)

set @QueryString2 = 'SELECT TOP 1 '+@kemu2+' FROM 
(
  SELECT * FROM #biaozhunfen T1
  WHERE NOT EXISTS
  (SELECT 1 FROM #biaozhunfen WHERE [DENSE_RANK] = T1.[DENSE_RANK] AND [ROW_NUMBER] > T1.[ROW_NUMBER])
) AS A 
ORDER BY ABS([PERCENT]-0.8)'
set @kemu2 =@in_kemu  --设置需传入动态语句的参数的值为@kemu

exec (@QueryString2) --请注意参数的顺序