Question

我正在尝试将排名字段转换为总分。例如，我有两个字段，rank1和rank1。

我可以使用以下方法将这些转化为分数：

rank1, 
CASE WHEN rank1=1 THEN 10
            WHEN rank1=2 THEN  6
            WHEN rank1=3 THEN  3
            WHEN rank1=4 THEN  2
            WHEN rank1=5 THEN  1
                        ELSE  0 END  AS score1,
rank2, 
CASE WHEN rank=1 THEN 10
            WHEN rank2=2 THEN  6
            WHEN rank2=3 THEN  3
            WHEN rank2=4 THEN  2
            WHEN rank2=5 THEN  1
                        ELSE  0 END  AS score2,

但是如何输出得分1 +得分2的总和？

我试过了：

SUM(score1 + score2) AS TotalScore,

但它并不喜欢它，因为score1和score2不是表格中的字段。

谢谢！

Answer 1

rank1, 
CASE WHEN rank1=1 THEN 10
            WHEN rank1=2 THEN  6
            WHEN rank1=3 THEN  3
            WHEN rank1=4 THEN  2
            WHEN rank1=5 THEN  1
                        ELSE  0 END  AS score1,
rank2, 
CASE WHEN rank2=1 THEN 10
            WHEN rank2=2 THEN  6
            WHEN rank2=3 THEN  3
            WHEN rank2=4 THEN  2
            WHEN rank2=5 THEN  1
                        ELSE  0 END  AS score2,
(CASE WHEN rank1=1 THEN 10
            WHEN rank1=2 THEN  6
            WHEN rank1=3 THEN  3
            WHEN rank1=4 THEN  2
            WHEN rank1=5 THEN  1
                        ELSE  0 END
+
CASE WHEN rank2=1 THEN 10
            WHEN rank2=2 THEN  6
            WHEN rank2=3 THEN  3
            WHEN rank2=4 THEN  2
            WHEN rank2=5 THEN  1
                        ELSE  0 END) as TotalScore

Answer 2

将SUM（）放在CASE语句周围：

SUM(CASE WHEN rank1=1 THEN 10
        WHEN rank1=2 THEN  6
        WHEN rank1=3 THEN  3
        WHEN rank1=4 THEN  2
        WHEN rank1=5 THEN  1
                    ELSE  0 END)  AS score1,
.....

mySQL - 输出两个计算字段的总和

2 个答案: