我有一个MySQL数据库。有1场比赛和1场比赛的比赛。换句话说，每场比赛2名球员。每位球员每场比赛只能进行一次。玩家也可能没有参加所有比赛。
我还希望找到每个玩家所玩的最后一场比赛，并将该比赛的玩家状态设为end_status。这不起作用。
换句话说，如果玩家在最后一场比赛中是1号球员，我希望将end_status_player1.status作为end_status。但是如果玩家在最后一场比赛中是2号球员，那么end_status_player2.status应该被用作end_status。
SELECT (end_status_player1.status, end_status_player2.status) AS end_status
FROM players
INNER JOIN teams ON teams.id = players.team_id /* OK */
/* if this is player's last match and he is player 1, this should be used */
LEFT JOIN matches AS player1 ON player1.chart_id = players.comp_id
AND player1.player1_id = players.id
LEFT JOIN status AS end_status_player1 ON end_status_player1.id = player1.user_status_id
/* if this is player's last match and he is player 2, this should be used */
LEFT JOIN matches AS player2 ON player2.chart_id = players.comp_id
AND player2.player2_id = players.id
LEFT JOIN status AS end_status_player2 ON end_status_player2.id = player2.user_status_id
WHERE players.comp_id = 107
GROUP BY teams.id