如何在 MySQL 的同一列上使用两次 Left Join？

Question

我有两张桌子，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...

以及另一个类似这样的路线

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

等等...

我需要从表中选择路线，但我也想获取机场名称。 令人困惑的是我需要查询机场代码两次。 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'

，你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'

Answer 2

只需给表指定两个不同的别名即可。 类似的东西（未经测试）；

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

Answer 3

您需要使用别名添加 AIRPORTS 表两次......

SELECT ORIGIN_AIRPORT.NAME,
       DESTINATION_AIRPORT.NAME
FROM   AIRPORTS ORIGIN_AIRPORT,
       AIRPORTS DESTINATION_AIRPORT,
       ROUTES
WHERE  ROUTES.ORIGIN = ORIGIN_AIRPORT.CODE
AND    ROUTES.DESTINATION = DESTINATION_AIRPORT.CODE;

Answer 4

在表名上添加别名：

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