Question

我正在尝试使用SUM（）来计算百分比来收集总数。

CONVERT(decimal(10,2), SUM(cola)/(SUM(cola)+SUM(colb)))

我检查过，SUM（可乐）= 3，SUM（colb）= 2;所以我期待它像......那样计算。

3/5 = .6;所以我希望得到回归，0.60，

以下是完整查询：

    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

Answer 1

你正在做Integer division。

如果你想要一个浮动结果，你至少需要一个操作数是浮点类型。

Answer 2

谢谢@Oded，（忘记将整数转换为十进制）所以，这就是我改变的......

SELECT CASE WHEN this < 0 THEN '-' 
                ELSE '+' END AS 'Col1', 
                SUM(cola) as 'this', SUM(colb) as 'that', 
                CONVERT(decimal(10,2), SUM(cola)/(CONVERT(decimal(10,2),
                SUM(cola))+CONVERT(decimal(10,2), SUM(colb))) as 'PCT' 
     FROM Table1 
    WHERE colc = 'Condition' 
 GROUP BY CASE WHEN this < 0 THEN '-' 
               ELSE '+' END

SQL：如何使用SUMS（）计算百分比

2 个答案: