How to do an INNER JOIN on multiple columns

Question

I\'m working on a homework project and I\'m supposed to perform a database query which finds flights either by the city name or the airport code, but the flights

Answer 1

If you want to search on both FROM and TO airports, you'll want to join on the Airports table twice - then you can use both from and to tables in your results set:

SELECT
   Flights.*,fromAirports.*,toAirports.*
FROM
   Flights
INNER JOIN 
   Airports fromAirports on Flights.fairport = fromAirports.code
INNER JOIN 
   Airports toAirports on Flights.tairport = toAirports.code
WHERE
 ...