Question

我有两张桌子 player1有行username，score，game_id，...
player2有行用户名，得分，game_id ...
如何为同一个game_id选择分数最高的用户名？

我拥有的是

SELECT player1.username winning,
  player1.points,
  player1.game_id 
FROM player1 
INNER JOIN player2 ON player1.game_id = player2.game_id
WHERE player1.points > player2.points

和

SELECT player2.username winning,
  player2.points,
  player2.game_id 
FROM player1 
INNER JOIN player2 ON player1.game_id = player2.game_id
WHERE player2.points > player1.points

Answer 1

这应该这样做：

SELECT
    game_id, 
    CASE WHEN p1.score > p2.score THEN p1.username ELSE p2.username END AS winner
FROM
    player1 p1
INNER JOIN
    player2 p2 ON p1.game_id = p2.game_id
ORDER BY 
    p1.game_id ASC

正如大流士所说，你可能希望根据抽奖情况调整CASE陈述，你可以将其改为：

CASE WHEN p1.score > p2.score THEN p1.username WHEN p1.score < p2.score THEN p2.username ELSE 'Draw' END AS winner

这实际上取决于您希望在该场景中显示的内容。

sql [db2]选择带条件的语句

1 个答案: