Comment by santiagobasulto

I did a quick test in Postgres using the sample Airlines database.

Here are the two tested queries:

Query 1:

    SELECT 
        t.passenger_name, 
        t.ticket_no, 
        bp.seat_no
    FROM 
        Flights f
    JOIN 
        Ticket_flights tf ON f.flight_id = tf.flight_id
    JOIN 
        Tickets t ON tf.ticket_no = t.ticket_no
    JOIN 
        Boarding_passes bp ON t.ticket_no = bp.ticket_no AND tf.flight_id = bp.flight_id
    WHERE 
        f.arrival_airport = 'OVB';

Query 2:

    SELECT 
        t.passenger_name, 
        t.ticket_no, 
        bp.seat_no
    FROM 
        Flights f
    JOIN 
        Ticket_flights tf ON (f.flight_id = tf.flight_id AND f.arrival_airport = 'OVB')
    JOIN 
        Tickets t ON tf.ticket_no = t.ticket_no
    JOIN 
        Boarding_passes bp ON t.ticket_no = bp.ticket_no AND tf.flight_id = bp.flight_id

Then I ran EXPLAIN for both of them and the query plan is THE same. So there's not a big difference at least in Postgres.

Here's the GPT conversation: https://i.imgur.com/dIzcfnc.jpeg

It doesn't let me share it because it contains an image