使用同一个 select 语句中的 N 动态选择前 N 个 [英] select top N dynamically with N from the same select statement

问题描述

我有一个程序试图为每个代理在表中插入样本，每个代理的样本数量根据某些计算而变化

I have a procedure that tries to insert samples in a table for each Agent, the # of samples for each agent varies based on some calculation

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

消息 4115，级别 15，状态 1，第 4 行
TOP 子句的参数中不允许引用列samplesize".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.

是否有解决方法?

感谢任何帮助.

提前致谢.

推荐答案

您可以使用 row_number() 来做本质上相同的事情:

You can use row_number() to do essentially the same thing:

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

你可以稍微简化一下，但我不知道 flag 是来自 du 还是 ss.

You might be able to simplify this a bit, but I don't know if flag is coming from du or ss.

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