Question

我不是MySQL专家，需要一些查询帮助。

table（t_teams）

团队|小组

Germany | A
Russia | B
Danmark | A
Japan | C

.....

table（t_matches）

id | fk_team1 | fk_team2 | points_team1 | points_team2
1 | Germany | Russia | 3 | 0
2 | Danmark | Japan | 3 | 0
3 | Germany | Japan | 3 | 0
4 | Russia | Danmark | 1 | 1

外键是： fk_team1 fk_team2

现在，我想通过mysql查询对每个团队的t_matches中的所有点进行求和。最终结果应该是

**team | points**
Germany | 6
Russia | 1
Danmark | 1
Japan | 0

我尝试过类似的东西，但它不起作用： - （

SELECT 
t1.team,
SUM(t2.points_team1) + SUM(t2.points_team2) AS points
FROM t_teams t1, t_matches t2
WHERE (t1.team = t2.fk_team1) OR (t1.team = t2.fk_team2)

当有人可以帮我解决这个简单的查询时，会很棒。

Answer 1

您需要取消数据，然后汇总结果：

select team, sum(points)
from ((select fk_team1 as team, points_team1 as points from t_teams t
      ) union all
      (select fk_team2 as team, points_team2 as points from t_teams t
      )
     ) t
group by team;

MySQL查询总和2行

1 个答案: