sql - 除以两个区间的两个和

Question

我有一个返回 24 行的查询。我想将SUMtirst 12index划分为SUMnext 12 index。我ROW_NUMBER像这样使用，但我无法过滤row。我怎么能做到这一点？

SELECT ROW_NUMBER() OVER(ORDER BY [Year] DESC,[Month] DESC) AS Row,[Year], [Month],
   PCode_9, [Index] 
FROM tbl08
WHERE PCode = @Code AND
  (([Year] * 12 + [Month]) <= @CurrentYearMonth) AND
  (([Year] * 12 + [Month]) >= @FCurrentYearMonth) AND row > 12   <-- ERROR
ORDER BY [Year] DESC,[Month] DESC

谢谢

Answer 1

由于您的查询返回 24 行试试这样

 Select t.*,(Sum(Case when row<=12 then Index else 0 End)/
Sum(Case when row>12 then Index else 0 End)) as Result from
(
SELECT ROW_NUMBER() OVER(ORDER BY [Year] DESC,[Month] DESC) AS Row,[Year], [Month],
PCode_9, [Index] 
FROM tbl08
WHERE PCode = @Code AND
(([Year] * 12 + [Month]) <= @CurrentYearMonth) AND
(([Year] * 12 + [Month]) >= @FCurrentYearMonth) AND row > 12   <-- ERROR
ORDER BY [Year] DESC,[Month] DESC
) t