带条件的sql[db2]select语句

我有两张桌子。
player1有行用户名、分数、游戏id，…
player2有行用户名、分数、游戏id…
如何为同一游戏id选择得分最高的用户名

我所拥有的是

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

及

这应该做到：

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Darius提到的，您可能希望根据抽签的情况调整案例陈述，您可以将其更改为以下内容：

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

CASE当p1.score>p2.score然后p1.username当p1.score

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这实际上取决于您希望在该场景中显示的内容。

您还可以优化案例表达式，以便在分数相等的情况下，返回一些信息来告诉您

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