Question

I have two table like this:

table1_ride
--------
id                 ride id
from_which_city    city id
to_city            city id

table2_city
--------
id                 city id
name               city name

What I want is when I submit query SELECT * FROM ride I want to show me ride_id, from_which_city, to_city like this:

1 Manchester Liverpool 

instead of

1 8 3 Where 8 = ManchesterID and 3 = LiverpoolID

I tried left join

SELECT * FROM ride LEFT JOIN city ON ride.from_which_city = city.id

and it’s working for from_which_city. How to do this to work for both – from_which_city and to_city.

I didnt find case where left join is like: t1.b = t2.a AND t1.c = t2.a.

Thanks in advance!

Answer 1

Join on the table2_city table twice and use an alias:

SELECT table1_ride.id, fc.name as from_city_name, tc.name as to_city_name
FROM table1_ride
INNER JOIN table2_city AS fc ON
    table1_ride.from_which_city=fc.id
INNER JOIN table2_city AS tc ON
    table1_ride.to_which_city=tc.id

(replace inner with left outer if necessary…).