SELECT * FROM flights;
SELECT origin, destination FROM flights;
SELECT * FROM flights WHERE id = 3;
SELECT * FROM flights WHERE origin = 'New York';
SELECT * FROM flights WHERE duration > 500;
SELECT * FROM flights WHERE destination = 'Paris' AND duration > 500;
SELECT * FROM flights WHERE destination = 'Paris' OR duration > 500;
SELECT COUNT(*) FROM flights;
SELECT AVG(duration) FROM flights;
