Mysql的问题与组由两列

Question

问题：

我有一些比赛结果的表。对于每辆车，有两名车手分别获胜。为了便于工作，我为每辆车创建了一行表格（所以两个驱动程序分为两列：driver1，driver2），而不是每个驱动程序一个，因为除了驱动程序之外，所有其他列的值都相同每辆车。

例子：

+------+-----+---------+---------+--------+ 
| race | car | driver1 | driver2 | points | + other variables with same value for both drivers 
+------+-----+---------+---------+--------+ 
| GER | 1 | Michael | Rick | 20 | 
| GER | 2 | Steve | Tom  | 8 | 
| JAP | 1 | Michael | Josh | 20 | 
| JAP | 2 | Steve | Tom  | 8 | 
+------+-----+---------+---------+--------+ 

正如你可以看到有两个以上的驱动车号1.所以，当我希望看到每个驱动程序在两站比赛的总得分，这应该是结果：

1. 迈克尔：40
2. 里克：20
3. 乔希：20
4. 史蒂夫：16
5. 汤姆：16

但我怎么组的得分为每个驱动程序处理的驱动（驱动1和驱动2）的两列？或者我只需要更改我的表格并为每个驱动程序创建一行？

$sql = "SELECT race, driver1, driver2, points FROM `example-table` GROUP BY ………. ORDER BY `points` DESC"; 

Answer 1

您可以使用union all运营商查询司机一列，然后group by司机和sum点：

SELECT driver, SUM(points) 
FROM  (SELECT driver1 AS driver, points FROM example_table 
      UNION ALL 
      SELECT driver2 AS driver, points FROM example_table) t 
GROUP BY driver 
ORDER BY 2 DESC 

Answer 2

SELECT driver, SUM(points) as points 
FROM 
    (SELECT driver1 as driver, points 
    FROM `example-table` 
    UNION ALL 
    SELECT driver2 as driver, points 
    FROM `example-table`)T 
GROUP BY driver