Question

查询：对于每种商品类别和每年，仅考虑意大利航线

选择每个月的平均每日收入
自年初以来的每月总收入

SQL：

SELECT
  gc.GoodCategory,
  tm.Month,
  tm.Year,
  SUM(ro.Income) / COUNT(DISTINCT tm.Date),
  SUM(ro.Income) OVER (PARTITION BY gc.GoodCategory, tm.Year 
    ORDER BY tm.Month ROWS UNBOUNDED PRECEDING)

FROM FactRoutes ro,
     DimLocation dp,
     DimLocation ds,
     DimGoodCategory gc,
     DimTime tm

WHERE ro.DepartureID = dp.LocationID
    AND ro.DestinationID = ds.LocationID
    AND ro.GoodCategoryID = gc.GoodCategoryID
    AND ro.GoodTimeID = tm.GoodTimeID
    AND dp.State = 'Italy'
    AND ds.State = 'Italy'

GROUP BY gc.GoodCategory,
     tm.Month,
     tm.Year;

但遇到以下错误

Column 'FactRoutes.Income' is invalid in the select list
because it is not contained in either an aggregate function
or the GROUP BY clause.

有什么更好的处理方法？

Answer 1

我认为您想要

SELECT
  gc.GoodCategory,
  tm.Month,
  tm.Year,
  SUM(ro.Income) / COUNT(DISTINCT tm.Date),
  SUM(SUM(ro.Income)) OVER (PARTITION BY gc.GoodCategory, tm.Year ORDER BY tm.Month)
FROM FactRoutes ro
INNER JOIN DimLocation dp ON ro.DepartureID = dp.LocationID
INNER JOIN DimLocation ds ON ro.DestinationID = ds.LocationID
INNER JOIN DimGoodCategory gc ON ro.GoodCategoryID = gc.GoodCategoryID
INNER JOIN DimTime tm ON ro.GoodTimeID = tm.GoodTimeID
WHERE dp.State = 'Italy' AND ds.State = 'Italy'
GROUP BY gc.GoodCategory, tm.Month, tm.Year;

主要要点是，为了使查询不是有效的聚合查询，您需要在window函数内使用聚合函数，例如SUM(SUM(ro.Income)) OVER (...)而不是SUM(ro.Income) OVER(...)，因此您会获得以前的 groups 记录的总和。

其他值得注意的地方：

始终使用显式联接（使用ON关键字）而不是老式的隐式联接（在FROM子句中使用逗号），其语法已经数十年
ROWS UNBOUNDED PRECEDING；您的窗口函数有一个ORDER BY子句，所以无论如何它都是这样做的

SQL：按分区聚合

1 个答案: