Question

我需要在子查询中划分两列的总和，按第三个字段分组，如下所示：

Team    |    Score     |    MaxScorePossible
--------------------------------------------
A       |      10      |     15
A       |      12      |     20
B       |      5       |     15
B       |      7       |     20

我的代码是这样的：

SELECT (sumScore/sumMaxScore) as Percentage
FROM
(SELECT 
   sum(Score) as sumScore 
   FROM tableScore
   GROUP BY Team ) tbl1,
(SELECT 
   sum(MaxScorePossible) as sumMaxScore 
   FROM tableScore
   GROUP BY Team ) tbl2,
GROUP By Team

我希望的输出是这样的： A =＆gt; 0.62，B =＆gt; 0.34

问题显然是我正在对子查询和父查询进行分组，但我不知道如何对另一个进行分组并使另一个进行相似的分组。

Answer 1

您不需要子查询。

SELECT Team, SUM(Score)/SUM(MaxScorePossible) AS Percentage
FROM tableScore
GROUP BY Team

如果您确实想使用子查询，则必须加入它们。

SELECT tbl1.Team, (sumScore/sumMaxScore) as Percentage
FROM
    (SELECT 
       Team, sum(Score) as sumScore 
       FROM tableScore
       GROUP BY Team ) tbl1
JOIN
    (SELECT 
       Team, sum(MaxScorePossible) as sumMaxScore 
       FROM tableScore
       GROUP BY Team ) tbl2 
ON tbl1.Team = tbl2.Team

对分组的子查询求和

1 个答案: