-- select * from actor;
-- SELECT CONCAT(first_name, ' ', last_name) FROM actor;
-- SELECT SUBSTRING(first_name, 1, 4) FROM actor;
-- SELECT LEFT(first_name, 2), RIGHT(last_name, 2) FROM actor;
-- SELECT TRIM(' John ');
-- SELECT LENGTH(first_name) FROM actor;
-- SELECT title FROM film WHERE rating = 'PG'
-- UNION
-- SELECT title FROM film WHERE rating = 'G';
-- SELECT f1.title AS film1, f2.title AS film2, f1.length
-- FROM film f1
-- JOIN film f2 ON f1.length = f2.length AND f1.film_id != f2.film_id;
SELECT c.first_name, s.store_id
FROM customer c
CROSS JOIN store s;