2个查询在同一个sql中

Question

我有一个数据集，我每天都有一些观察结果。我想按日期对它们进行分组，然后取每日每日总和的平均值（以SQL为单位）。

用于按天分组的SQL看起来像这样并且有效。

"SELECT Date, Sum(Margin) FROM [OpenPositions] GROUP BY Date"

我已尝试使用以下代码在一个SQL中执行预期的查询。

    "SELECT Datepart(week, Date), 
            Avg(avgmargin) 
      FROM (SELECT Datepart(year, Date) Year, 
                   Datepart(week, Date) Week, 
                   Sum(Margin) sum 
              FROM [OpenPositions] 
  GROUP BY Datepart(year, Date), 
           Datepart(week, Date)"

但这不起作用（没有显示任何数据）。任何人都可以在我的SQL查询中找到错误，以及如何解决它？

所有帮助表示赞赏。

Answer 1

试试这个：

Select Datepart(week, Date), Avg(avgmargin) from (
SELECT Date, Sum(Margin) AS Margin FROM [OpenPositions] GROUP BY Date)
Group By Datepart(week, Date)

编辑＃2

试试这个：

Select TBL.week, Avg(TBL.margin) from (
SELECT Datepart(week, Date) as week ,Datepart(day, Date), Sum(Margin) AS margin 
FROM [OpenPositions] GROUP BY Datepart(week, Date),Datepart(day, Date)) as TBL
Group By TBL.week

@ calc16关于你的回复，为什么不这样做：

Select TBL.week, Avg(TBL.margin) from 
(SELECT Datepart(week, Date) as week, Date, Sum(Margin) AS margin FROM[OpenPositions]
 GROUP BY Datepart(week, Date), Date) as TBL
Group By TBL.week

编辑＃4

您应该在内部查询中将年份添加到组中。

Select TBL.week, , Avg(TBL.margin) from 
(SELECT Datepart(week, Date) as week,Datepart(year, Date) as year, Date, Sum(Margin) AS margin FROM[OpenPositions]
 GROUP BY Datepart(week, Date), Datepart(year, Date) ,Date) as TBL
Group By TBL.week, TBL.year