如何使用MySQL在同一列上使用两次左连接？

我有两张桌子，一张是机场的，一张是路线的

机场看起来有点像这样

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

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

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'

等等

还有一条是这样的路线

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

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

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'

等等

我需要从表中选择路线，但我还想获得机场名称。令人困惑的是，我需要查询两次机场代码。我正在尝试这样的事情

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

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

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，这是行不通的。我该怎么做呢？

给表格两个不同的别名。类似于（未经测试）

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'

---

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;

---

在表名称上添加别名：

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'

---

嗯。Caps Lock Day是另一个日期；）