php - 计算重复 WHERE id=?

Question

我希望能够SELECT opponents id from a db table WHERE id=$currplayer。

我的数据库表是这样的： fk_player fk_opponent

如果我这样做：

SELECT fk_opponent
     , COUNT(fk_opponent) AS oplay 
FROM nf_newversus 
     GROUP BY fk_opponent

它做对了，但我希望能够对此进行排序，所以它只是那些 fk_player = $currplayer... 我试图插入 aWHERE fk_player = $currplayer但这是不对的...

任何帮助表示赞赏。

Answer 1

根据您的描述，这应该是正确的：

SELECT fk_opponent, COUNT(*) AS oplay
FROM nf_newversus 
WHERE fk_player='$currplayer'
GROUP BY fk_opponent

如果您的表允许多个player1 vs player2（即没有UNIQUE(fk_player, fk_opponent)索引），那应该可以正常工作，但假设您以两种方式存储匹配项。

Answer 2

SELECT fk_opponent
     , COUNT(fk_opponent) AS oplay
FROM nf_newversus 
WHERE fk_player = '$currplayer'
GROUP BY fk_opponent