將一個MYSQL表中的單個記錄連接到第二個中的兩個記錄

Question

我有兩個MYSQL表，團隊和固定裝置。 他們看起來像這樣...

TEAMS
   team_id   |   team   
---------------------------------
      1      | Manchester United  
      2      | Liverpool  
      3      | Chelsea

FIXTURES
fixture_id  |    date    |  home_team_id   |   away_team_id   
--------------------------------------------------------------
    1       | 2014-01-06 |       1         |        2 
    2       | 2014-02-06 |       2         |        3  
    3       | 2014-03-06 |       3         |        1

我正在嘗試做的是寫一個查詢，產生一個類似...的結果。

   fixture_id  |   date     |  home_team         |   away_team   
--------------------------------------------------------------------------
       1       | 2014-01-06 |  Manchester United |   Liverpool 
       2       | 2014-02-06 |  Liverpool         |   Chelsea 
       3       | 2014-03-06 |  Chelsea           |   Manchester United

如何將單個裝置表中的home_team_id和away_team_id加入到teams表中的兩個team_id記錄中？

謝謝你的幫助

朱爾斯

Answer 1

您需要加入團隊兩次作為

select 
f.fixture_id,
f.date,
t1.team as home_team,
t2.team as away_team
from FIXTURES f
join TEAMS t1 on t1.team_id = f.home_team_id
join TEAMS t2 on t2.team_id = f.away_team_id

Answer 2

您只需要兩次連接到TEAMS表，如下所示：

select fixture_id, date, h.team as home_team, a.team as away_team
from fixtures f
inner join teams h on f.home_team_id = h.team_id
inner join teams a on f.away_team_id = a.team_id

Answer 3

這應該可以解決您的問題。 將團隊表加入到FIXTURES表中

select fixture_id,date,hometeam.team,awayteam.team from    FIXTURES join TEAMS hometeam on home_team_id = hometeam.id join TEAMS awayteam on home_team_id = awayteam.id