Question

我尝试制作一个查询，显示一段时间内每小时的平均总订单数。

我这样试试：

SELECT [day], 
       [hour], 
       [dayn], 
       Avg(totals) AS [Avg] 
FROM   (SELECT [document no_] AS hallo, 
               Cast(CONVERT(VARCHAR, [shipment date], 101) AS DATE), 
               w = Datediff(week, 0, [timestamp]), 
               [Day] = Datename(weekday, [timestamp]), 
               [DayN] = Datepart(weekday, [timestamp]), 
               [Hour] = Datepart(hour, [timestamp]), 
               Totals = Count(*) 
        FROM   [verploegen poc$sales line] 
        WHERE  [shipment date] BETWEEN '2016-01-01' AND '2016-12-31' 
          AND ( [document no_] NOT LIKE '%RET%' 
                AND [document no_] NOT LIKE '%OFF%' 
                AND [document no_] NOT LIKE '%CV%' 
                AND [document no_] NOT LIKE '%RC%' ) 
        GROUP  BY [document no_], 
                  [shipment date], 
                  Datediff(week, 0, [timestamp]), 
                  Datename(weekday, [timestamp]), 
                  Datepart(weekday, [timestamp]), 
                  Datepart(hour, [timestamp])) AS hallo 
GROUP  BY [day], 
          [hour], 
          [dayn] 
ORDER  BY dayn;

但我收到错误：

没有为＆＃39; hallo＆＃39;。
的第2列指定列名

但如何纠正这个？

谢谢

我现在就这样：

SELECT [Day], [Hour], [DayN], AVG(Totals) AS [Avg]
FROM
(
    SELECT [Document No_] as hallo,  cast(CONVERT(varchar, [Shipment Date], 101) as date) as number,   
  w = DATEDIFF(WEEK, 0, [timestamp]),
      [Day]  = DATENAME(WEEKDAY, [timestamp]),
      [DayN] = DATEPART(WEEKDAY, [timestamp]),
      [Hour] = DATEPART(HOUR,    [timestamp]),
      Totals = COUNT(*)
    FROM [Verploegen POC$Sales Line]
     WHERE [Shipment Date] BETWEEN '2016-01-01' and '2016-12-31'
AND ([Document No_] NOT LIKE '%RET%' AND [Document No_] NOT LIKE  '%OFF%'
AND [Document No_] NOT LIKE '%CV%' AND [Document No_]  NOT LIKE '%RC%')
    GROUP BY 
    [Document No_], [Shipment Date],
  DATEDIFF(WEEK, 0, [timestamp]),
      DATENAME(WEEKDAY, [timestamp]),
      DATEPART(WEEKDAY, [timestamp]),
      DATEPART(HOUR,    [timestamp])
  ) AS hallo 
GROUP BY [Day], [Hour], [DayN]
ORDER BY DayN;

但是我收到了这个错误：

Arithmetic overflow error converting expression to data type datetime.

Answer 1

您必须在子查询中对列进行别名，以便以后可以引用它们。

cast(CONVERT(varchar, [Shipment Date], 101) as date) as whatYouNameIt

上面的行需要有一个列别名，以便您可以使用hallo.whatYouNameIt

来引用它

平均每小时订单总数

1 个答案: