我有这两张桌子
airports: airportid, airportname
flights: flightid, from_airport, to_airport
其中
from_airport
和to_airport
是外键。我可以在
airportid
和from_airport
或airportid
和to_airport
上连接表,我可以得到to_airport
的名称或from_airport
的名称,但我希望在一个查询中或以最低成本同时选择to_airport
和from_airport
的名称。有可能吗??怎么做??
我的问题是:
SELECT
flight.idflight,
flight.idairline,
flight.from_airport,
flight.to_airport,
flight.number,
airports.name AS origin
FROM
flight
Inner Join airports ON flight.from_airport = airports.idairports
最佳答案
别名你的桌子,当你做接缝:
SELECT
flight.idflight,
flight.idairline,
flight.from_airport,
flight.to_airport,
flight.number,
airport_from.name AS origin
airport_to.name AS destination
FROM flight
INNER JOIN airports airport_from ON flight.from_airport = airport_from.idairports
INNER JOIN airports airport_to ON flight.to_airport = airport_to.idairports
关于mysql - mysql查询-2个外键,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/5504166/