从同一个select语句中用N动态选择前N个

Question

我有一个程序试图在每个代理的表中插入样本，每个代理的样本数根据一些计算而变化

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()

我在这里遇到的错误是

  

Msg 4115，Level 15，State 1，Line 4
  TOP子句的参数中不允许引用“samplesize”列。仅引用外部的列   此处允许使用范围或独立表达式和子查询。

有解决方法吗？

感谢任何帮助。

提前致谢。

Answer 1

您可以使用row_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

您可以稍微简化一下，但我不知道flag是来自du还是ss。

Answer 2

我在同一个问题上添加了一个场景。 我对现有解决方案进行了一些更改，方案是： 我每天都会得到一份代理列表，并且必须向每个代理发送一组随机调查，计数取决于每个代理的一些计算。

--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像

这样的表

我需要来自每个组的N行，其中N来自SampleSize列。