SQL Server 2012 函数“Percentile_Cont”-按问题分组

Question

我整天都在尝试计算某个字段的第 50 个百分位数，我想我已经接近了，但我有点卡住了。

这是正常代码，没有percentile_cont：

declare @st_date datetime;
declare @en_date datetime;
declare @days int;

set @en_date = (@en_datein);
set @st_date = (@st_datein);

select 
    srt.Name,
    cast(sum(sr.price) as int) as AvgCost,
    cast(sum(sr.cost) as int) as AvgTransCost,
    cast(avg(sr.TotalTimeSpent) as int) as TotalTimeSpent
from 
    ServiceReq sr, ServiceReqTemplate srt
where 
    sr.SvcReqTmplLink_RecID = srt.RecId
    and sr.CreatedDateTime >= @st_date
    and sr.CreatedDateTime <= @en_date
group by 
    srt.Name
order by 
    1

这是我添加percentile_cont时的代码：

declare @st_date datetime;
declare @en_date datetime;
declare @days int;

set @en_date = (@en_datein);
set @st_date = (@st_datein);

SELECT srt.Name,
    percentile_cont(.5) WITHIN GROUP(ORDER BY sr.price) OVER(PARTITION BY srt.Name) AS MedianSpend,
    cast(sum(sr.price) as int) as AvgCost,
    cast(sum(sr.cost) as int) as AvgTransCost,
    cast(avg(sr.TotalTimeSpent) as int) as TotalTimeSpent
from 
    ServiceReq sr, ServiceReqTemplate srt
where 
    sr.SvcReqTmplLink_RecID = srt.RecId
    and sr.CreatedDateTime >= @st_date
    and sr.CreatedDateTime <= @en_date
group by 
    srt.Name
order by 
    1

如果我尝试执行此操作，我会收到错误：

选择列表中的 sr.price 列无效，因为它既不包含在聚合函数中，也不包含在 GROUP BY 子句中

我已经用谷歌搜索了这个错误，并且一直在阅读 StackOverFlow，但我还没有解决这个问题。我尝试添加第二个 Group By，但我不知道我应该使用哪个变量，或者我是否正确地这样做了！！

如何使 percentile_cont 代码与同一 Select 语句下的强制转换代码一起工作？？

Answer 1

我不确定它是否会为您提供所需的输出，但它会修复错误。 试试这个

percentile_cont(.5) WITHIN GROUP(ORDER BY sum(sr.price)) OVER(PARTITION BY srt.Name) AS MedianSpend

完整的陈述

declare @st_date datetime;
declare @en_date datetime;
declare @days int;

set @en_date = (@en_datein);
set @st_date = (@st_datein);

SELECT srt.Name,
    percentile_cont(.5) WITHIN GROUP(ORDER BY sum(sr.price)) OVER(PARTITION BY srt.Name) AS MedianSpend,
    cast(sum(sr.price) as int) as AvgCost,
    cast(sum(sr.cost) as int) as AvgTransCost,
    cast(avg(sr.TotalTimeSpent) as int) as TotalTimeSpent
from 
    ServiceReq sr, ServiceReqTemplate srt
where 
    sr.SvcReqTmplLink_RecID = srt.RecId
    and sr.CreatedDateTime >= @st_date
    and sr.CreatedDateTime <= @en_date
group by 
    srt.Name
order by 
    1