Sql 使用同一select语句中的N动态选择top N

我有一个程序，尝试在表中为每个代理插入样本，每个代理的样本数量根据某些计算而变化

Declare @samplesize int
Declare @Top int
set @samplesize=0

;WITH DataToInsert AS
(
    Select AgentID, Surveys, LOB,(case when day(getdate())<4 then 3 else (day(getdate())) - (Surveys*3) end) SampleSize from Current_Agent_SurveyCount_HSI Where surveys<8 
)

--Insert Into Survey_Source_New (LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp])  
--Select top 5 ss.LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp]  
--From Survey_source_Level1 ss
--inner join DataToInsert du on ss.AgentZID=du.agentID
--where flag is null and du.samplesize>6
--order by newid()

Insert Into Survey_Source_New (LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp])  
Select top (@Top) @Top=du.samplesize,ss.LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp]  
From Survey_source_Level1 ss
inner join DataToInsert du on ss.AgentZID=du.agentID
where flag is null and du.samplesize<7
order by newid()

我在这里得到的错误是

Msg 4115，第15级，状态1，第4行 TOP子句的参数中不允许引用列samplesize。仅在外部位置引用列 此处允许范围或独立表达式和子查询

有解决办法吗

感谢您的帮助

提前感谢。

您可以使用row\u number执行基本相同的操作：

WITH DataToInsert AS
(
    Select AgentID, Surveys, LOB,(case when day(getdate())<4 then 3 else (day(getdate())) - (Surveys*3) end) SampleSize from Current_Agent_SurveyCount_HSI Where surveys<8 
)
Insert Into Survey_Source_New (LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp])  
    select LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp]
    from (Select ss.LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp],
                 row_number() over (order by newid()) as seqnum
          From Survey_source_Level1 ss inner join
               DataToInsert du on ss.AgentZID=du.agentID
          where flag is null and du.samplesize<7
         ) t
    where seqnum <= du.sample_size

---

你也许可以简化一下，但我不知道flag是来自du还是ss。

我在同一个问题上增加了一个场景。 我对现有解决方案做了一些更改，场景是： 我每天都会收到一份代理名单，并向每个代理发送一组随机调查，数量取决于每个代理的计算结果

--Get Agent List
;WITH AgentsList AS    
(    
    Select AgentID, Surveys, LOB,(case when day(getdate())<4 then 3 else (day(getdate())) - (Surveys*3) end) SampleSize     
    from Current_Agent_SurveyCount_FIOS Where surveys<8     
)
--Get All the Surveys for each Agent
, AgentSurveys AS
(
    select ss.LOB, ss.CenterName, ss.CallDate, ss.AgentZid, ss.TN, ss.Ticket, ss.RecordingID, ss.Cycle, ss.[TimeStamp],ss.Flag,AL.samplesize 
    from Survey_Source_Level1_Sri ss
    inner join AgentsList AL on ss.AgentZID=AL.agentID
    where flag is null 
    GROUP BY ss.LOB, ss.CenterName, ss.CallDate, ss.AgentZid, ss.TN, ss.Ticket, ss.RecordingID, ss.Cycle, ss.[TimeStamp],ss.Flag,AL.samplesize
)
--Mark random ranking for each survey
Select LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp],samplesize,    
             rank() over (partition by agentzid order by newid()) as seqnum    
      From AgentSurveys
      group by LOB, CenterName, CallDate, AgentZid, TN, Ticket, RecordingID, Cycle, [TimeStamp],samplesize      
      order by agentzid,seqnum,tn

现在，从上一个查询中，我得到一个如下表

---

我需要每个组的N行数，其中N来自SampleSize列。

选择LOB、CenterName、CallDate、AgentZid、TN、Ticket、RecordingID、Cycle、[TimeStamp]、SampleSize、seqnum从选择LOB、CenterName、CallDate、AgentZid、TN、Ticket、RecordingID、Cycle、[TimeStamp]、SampleSize、，按agentzid按分区排序按newid按LOB、CenterName、CallDate、agentzid、TN、Ticket、RecordingID、Cycle、[TimeStamp]，samplesize t从AgentServeys组中按seqnum排序按seqnum排序按LOB、CenterName、CallDate、agentzid、TN、Ticket、RecordingID、Cycle、[TimeStamp]，samplesize t在seqnum中这对问题有效？