劃分兩個SUM的兩個區間

Question

我有一個返回24行的查詢。我想把第的SUM分成SUM下12個index。我使用這樣的ROW_NUMBER，但我不能過濾row。我如何做到這一點？

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 

感謝

Answer 1

由於查詢返回24 rowsTry喜歡這個

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