mysql查詢連接三個表

Question

我有三張桌子：

players
------
id|name 

teams
-------
id|name 

teams_players
-------------
id|teamID|playerID

我現在想要從表“玩家”獲得每個條目，其中players.id例如在ID為15的團隊中。換句話說：我想讓每個屬於特定團隊的玩家（例如teamID = 15）

我嘗試了一個連接，但它失敗了。

這是我到目前為止所得到的：

       "SELECT players.*
        FROM players
        JOIN teams_players
        ON teams_players.teamID = 15 
        GROUP BY players.id"; 

Answer 1

你太過於復雜了。

select players.*
 from players
 join teams_players
 on players.id = teams_players.playerid
 where teams_players.teamid = 15

JOIN部分與數字15無關.15是過濾結果的方式。

Answer 2

您可以使用多個條件加入表，也沒有在on子句中提及表之間的關系

SELECT players.*
        FROM players
        JOIN teams_players
        ON (players.id = teams_players.playerid AND teams_players.teamID = 15 )
        GROUP BY players.id