Question

我有一张这样的表：

player1    player2    player3    player4    score1    score2
   1          2          3          4         11         2  
   1          2          3          4          4         11
   2          1          3          4         11         5

如果我查询：SELECT player1, player2, SUM(score1) FROM mytable GROUP BY player1, player2

我会得到：

player1   player2   SUM(score1)
   1         2          15
   2         1          11

但是，我希望GROUP BY player1,player2 AND player2,player1同时获得：

player   player   SUM(score1)
   1         2         26

有没有人知道它是否可能（我使用MySQL）。

如果不是，您是否知道在PHP中使用它的好方法？

Answer 1

您可以使用least()和greatest()：

select least(player1, player2), greatest(player1, player2), sum(score1)
from mytable
group by least(player1, player2), greatest(player1, player2);

Answer 2

或试试这个

select min(player1) as player1,max(player2) as player2, sum(score1) as score1 from
(
select player1, player2, SUM(score1) as score1 FROM mytable GROUP BY player1, player2
) as t

GROUP BY（a，b）和（b，a）

2 个答案: