Mysql查询 - 无法想出办法做到这一点

Question

INSERT INTO `table` (`game_id`, `first`, `second`, `third`) 
VALUES 
    (1, 'jack', 'joe', 'pat'), 
    (2, 'jack', 'joe', 'jess'), 
    (3, 'pat', 'jess', 'jack'), 
    (4, 'pat', 'jess', 'jack'); 

这是一个统计表，每个游戏的前三名球员。我期待拉动所有的球员，并相应地订购他们。

First place - 3 points 
Second place - 2 points 
Third place - 1 point 

所以，它应该返回：

id player points 
1 jack 8 
2 pat  7 
3 jess 5 
4 joe  4 

我不能想出一个办法，用一个查询来做到这一点。

Answer 1

Select player, sum(points) as points from (
Select `first` as player, count(`first`)*3 as points From gameStats group by `first` 
union all 
Select `second` as player, count(`second`)*2 as points From gameStats group by `second` 
union all 
Select `third` as player, count(`third`)*1 as points From gameStats group by `third`) as tmp group by player 

这应该做到这一点。

让我知道你是否需要任何帮助。