MYSQL查询显示客队名称和主队名称答案

【问题标题】：MYSQL query to display away team name and home team nameMYSQL查询显示客队名称和主队名称
【发布时间】：2019-03-20 14:41:15
【问题描述】：

我有两张桌子。
游戏包括 Date、hteam、ateam、hscore、acore。
团队包括 id、tname。

这个查询：

SELECT
    games.DATE,
    teams.tname AS "Away",
    games.ascore AS "A Score",
    games.hteam AS "Home",
    games.hscore AS "H Score"
FROM
    games
INNER JOIN teams ON games.ateam = teams.id
LEFT OUTER JOIN teams AS t
ON
    games.hteam = t.tname
ORDER BY
    games.DATE ASC

最终产生这个输出：

DATE Ascending 1        Away        A Score Home    H Score     
2008-01-01 20:00:00     Saxons      2       3       0
2008-01-01 20:00:00     Spurs       0       1       1
2008-01-08 20:00:00     Saxons      1       2       2
2008-01-08 20:00:00     Celtics     1       1       1

我的问题是如何让主队显示为它的名称，而不是它的 id，所以输出是：

DATE Ascending 1        Away        A Score Home        H Score     
2008-01-01 20:00:00     Saxons      2       Celtics     0
2008-01-01 20:00:00     Spurs       0       Wanderers   1
2008-01-08 20:00:00     Saxons      1       Spurs       2
2008-01-08 20:00:00     Celtics     1       Wanderers   1

【问题讨论】：

标签： mysql

【解决方案1】：

您需要再次加入“团队”表才能获得结果。所以类似于：

SELECT
    games.DATE,
    teams_away.tname AS "Away",
    games.ascore AS "A Score",
    teams_home.tname AS "Home",
    games.hscore AS "H Score"
FROM
    games
INNER JOIN teams teams_away ON games.ateam = teams_away.id
INNER JOIN teams teams_home ON games.hteam = teams_home.id
ORDER BY
    games.DATE ASC

【讨论】：

【解决方案2】：

这是一种使用子查询编写查询的方法，它避免了连接：

SELECT
    games.DATE,
    (SELECT tname FROM teams WHERE teams.id = games.hteam) AS "Away",
    games.ascore AS "A Score",
    (SELECT tname FROM teams WHERE teams.id = games.ateam) AS "Home",
    games.hscore AS "H Score"
FROM
    games
ORDER BY
    games.DATE ASC

【讨论】：

这个解决方案对我来说读起来更好，但运行速度比上面的建议稍慢。