我可以在where条件中使用select out变量吗？

Question

请查看我的sql语句：

declare @rptID as int
declare @lastRptID as int

select  @rptID = 238507
select top 1 @lastRptID = reportid from MeraRpt  where reportid < @rptid order by reportid desc

 SELECT
           @rptid
           ,[BelongTo] as Customer  
           ,[Prefix] as Prefix
           ,sum([ASRSuccessCalls])
        　　, (select sum(ASRSuccessCalls) from [V_MeraRpt_Detail_ByPrefix] a 
            where a.[BelongTo] = Customer and a.[Prefix] = Prefix
            and a.[reportID] in (@rptID,@lastRptID))

      from [V_MeraRpt_Detail_ByPrefix]
      where reportid = @rptid and Customer in (select custid from v_MostUsedCustomer )
      group by [BelongTo],[Prefix]

这个sql可以通过编译运行，但是它给出了错误的结果，问题就是这句话：

(select sum(ASRSuccessCalls) from [V_MeraRpt_Detail_ByPrefix] a 
                where a.[BelongTo] = Customer and a.[Prefix] = Prefix
                and a.[reportID] in (@rptID,@lastRptID))

结果是这种形式：

238507  Umobile 23480   1   4294
238507  Umobile 234803  0   4294
238507  Umobile 62811   0   4294
238507  01.2136 62812   10  4294
238507  Umobile 62812   18  4294
238507  01.2136 62813   15  4294
238507  Umobile 62813   17  4294

请查看最后一栏，它是完全相同的值。但我确信正确的结果应该根据不同的客户和前缀不同，我认为哪里的情况发生了一些错误， 任何人都可以告诉我如何解决它？谢谢。