SQL select查询在两个单独的列

Question

场景是我有一个固定装置列表如下所示。固定由团队ID表示

灯具表

FixtureID    HomeTeam   AwayTeam
1            1          2
2            2          4

然后我需要查看Team表以获取每个团队的名称

团队表

TeamID  TeamName
1       Team1
2       Team2

我需要运行一个查询，它将获取灯具并将TeamID更改为团队名称，因此它看起来像

HomeTeam TeamName AwayTeam TeamName
 1       Team1    2         Team2
 2       Team2    4         Team4 

目前我有

SELECT  Fixtures.HomeTeam, Teams.TeamName, Fixtures.AwayTeam
FROM Fixtures INNER JOIN
Teams ON Fixtures.HomeTeam = Teams.TeamID

哪个输出：

HomeTeam TeamName             AwayTeam
1        Donegal Celtic       2
2        Banbridge Town       1
3        Limavdy United       5

我只是难以让球队的名字显示出来。任何帮助都会受到赞赏。

Answer 1

您只需要两个连接：

SELECT f.HomeTeam, th.TeamName, f.AwayTeam, ta.TeamName
FROM Fixtures f INNER JOIN
     Teams th
     ON f.HomeTeam = th.TeamID INNER JOIN
     Teams ta
     ON f.AwayTeam = ta.TeamId;

Answer 2

你需要join两次团队表，例如：

SELECT f.FixtureID, t1.TeamID, t1.name, t2.TeamID, t2.name
FROM fixtures f JOIN team t1 ON f.hometeam = t1.TeamID
JOIN team t2 on f.awayteam = t2.TeamID;

这是 SQL Fiddle 。

Answer 3

使用Teams表格加入Fixtures表格两次。

SELECT Fixtures.HomeTeam, t1.TeamName, Fixtures.AwayTeam, t2.TeamName
FROM Fixtures INNER JOIN
Teams t1
ON Fixtures.HomeTeam = t1.TeamID 
INNER JOIN
Teams t2
ON Fixtures.AwayTeam = t2.TeamId;

Working示例。