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我試圖使用SUM()來計算百分比以收集總計。SQL:如何使用SUMS計算百分比()
CONVERT(decimal(10,2), SUM(cola)/(SUM(cola)+SUM(colb)))
我檢查了SUM(可樂)= 3和SUM(colb)= 2;所以我期待它像計算...
3/5 = .6;所以,我希望能得到恢復,0.60,
下面是完整的查詢:
SELECT CASE WHEN this < 0 THEN '-'
ELSE '+' END AS 'Col1',
SUM(cola) as 'this', SUM(colb) as 'that',
CONVERT(decimal(10,2), SUM(cola)/(SUM(cola)+SUM(colb)) as 'PCT'
FROM Table1
WHERE colc = 'Condition'
GROUP BY CASE WHEN this < 0 THEN '-'
ELSE '+' END
我建議你閱讀[Integer Division](http://www.peterbe.com/Integer-division-in-programming-languages)。您至少需要一個操作數纔是浮點類型。 – Oded
@davomcd:看看這裏http://stackoverflow.com/q/1763989/247184的想法。 – VoodooChild
@Oded謝謝!我不敢相信我忽略了這一點。 – daveomcd