sql - 滚动季度的 SQL 报告

Question

这是我使用的示例数据。根据这些数据，我需要创建滚动季度报告。换句话说，月度报告回顾了 3 个月。问题是我需要报告平均值和总和。以下是我正在寻找的输出格式。

我试图弄清楚实现这一点的最佳方法是什么？我应该按季度计算还是应该按月计算？

目前这个过程是在 Excel 中完成的，所以我实际上正在处理还没有关系的表。

Answer 1

蛮力解决方案

WITH MonthData AS (
    SELECT (YEAR(Date) - 2000) * 12 + MONTH(Date) AS MonthNumber
          ,Count1
          ,Count2
    FROM Table
)
,QuarterData AS (
    SELECT MAX(MonthNumber) AS MonthNumber
          ,SUM(Count1)/COUNT(1) AS MeanCount1
          ,SUM(Count2)/COUNT(1) AS MeanCount2
          ,SUM(Count1) AS SumCount1
          ,SUM(Count2) AS SumCount2
    FROM MonthData
    GROUP BY MonthNumber / 3 
  UNION ALL
    SELECT MAX(MonthNumber)
          ,SUM(Count1)/COUNT(1)
          ,SUM(Count2)/COUNT(1)
          ,SUM(Count1)
          ,SUM(Count2)
    FROM MonthData
    GROUP BY (MonthNumber + 1) / 3   
  UNION ALL
    SELECT MAX(MonthNumber)
          ,SUM(Count1)/COUNT(1)
          ,SUM(Count2)/COUNT(1)
          ,SUM(Count1)
          ,SUM(Count2)
    FROM MonthData
    GROUP BY (MonthNumber + 2) / 3 
)
SELECT DATEADD(month, MonthNumber, '20000101') AS Period
      ,MeanCount1
      ,MeanCount2
      ,SumCount1
      ,SumCount2
FROM QuarterData