mysql - 如何在 MySQL 的同一列上使用 Left Join 两次？

Question

我有两张表，一张用于机场，一张用于航线。

机场看起来有点像这样

Airports
-------------------------------------
id | code | name                    |
-------------------------------------
01 | LGW  | London Gatwick          |
-------------------------------------
02 | LHR  | London Gatwick          |

等等....

还有一个像这样的路线

Routes
---------------------------
id | ORIGIN | DESTINATION |
---------------------------
01 | LGW    | VCE         |
---------------------------
02 | TSF    | LHR         |

等等……

我需要从表中选择路线，但我也想获得机场名称。令人困惑的一点是我需要两次查询机场代码。我正在尝试这样的事情

SELECT routes.*, airports.name as origin_name FROM routes
LEFT JOIN airports ON airports.IATA = routes.origin
LEFT JOIN airports ON airports.IATA = routes.destination
WHERE origin = 'LHR' AND destination = 'VCE' OR origin = 'VCE'

您可能知道也可能不知道，但行不通。我该怎么做呢？

Answer 1

使用别名:

SELECT
    routes.*,
    a1.name AS origin_name,
    a2.name AS destination_name
FROM routes r
LEFT JOIN airports a1 ON a1.IATA = r.origin
LEFT JOIN airports a2 ON a1.IATA = r.destination
WHERE
    r.origin = 'LHR' AND r.destination = 'VCE' OR r.origin = 'VCE'