PHP中的SQL查询，将具有相同外键的两列的表连接起来

所以我需要加入5个表。其中一个我有问题。它有两列，它们是不同表的相同外键

matchdetail  
idmatch | idplayer1 | idplayer2 | time | (FK) idmatchnight (FK)

这是一张连接桌子

player
(PK) idplayer | firstname | secondname | nationality 

matchnight
(PK) idmatchnight | location 

我的sql查询应该是什么

我当前的代码：不工作

SELECT * FROM player
INNER JOIN coach ON player.idcoach = coach.idcoach
INNER JOIN sponsor ON player.idsponsor = sponsor.idsponsor
INNER JOIN matchdetail ON player.idplayer = matchdetail.idplayer1
                                        AND player.idplayer = matchdetail.idplayer2
INNER JOIN matchnight ON matchdetail.idmatch
WHERE player.idplayer=:idplayer
;"

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idmatch是一个代理主键，而不是复合键。可能最好重新编写查询：

SELECT ...
FROM matchdetail
INNER JOIN player AS p1 ON matchdetail.player1=p1.idplayer
INNER JOIN player AS p2 on matchdetail.player2=p2.idplayer
etc...

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您当前的加入基本上只允许玩家自己进行比赛。通过加入

player

两次，您可以获得两个不同玩家的详细信息。

如果您希望保留此逻辑，您还可以使用或代替AND：

SELECT columns, you, actually, want 
  FROM matchnight m
  JOIN matchdetail d
    ON d.idmatchnight = m.idmatchnight
  JOIN player p1
    ON p1.idplayer = d.idplayer1
  JOIN player p2
    ON p2.idplayer = c.idplayer2;

SELECT * FROM player
INNER JOIN coach ON player.idcoach = coach.idcoach
INNER JOIN sponsor ON player.idsponsor = sponsor.idsponsor
INNER JOIN matchdetail ON (player.idplayer = matchdetail.idplayer1
                                        OR player.idplayer = matchdetail.idplayer2)
INNER JOIN matchnight ON matchdetail.idmatch
WHERE player.idplayer=:idplayer;

问题是，对于当前谓词（with AND），它基本上与：

player.idplayer = matchdetail.idplayer1 = matchdetail.idplayer2

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谢谢大家的回答

我自己找到了解决办法：）

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一个小小的解释会有很大帮助；-）

SELECT * FROM matchdetail
INNER JOIN boxer ON matchdetail.idplayer1
                    AND matchdetail.idplayer2
INNER JOIN coach ON player.idcoach = coach.idcoach
INNER JOIN sponsor ON player.idsponsor = sponsor.idsponsor
INNER JOIN matchnight ON matchdetail.idmatchnight = matchnight.idmatchnight
WHERE player.idplayer