[lab-sql-self-cross-join]Giuliana

[lab-sql-self-cross-join]Giuliana.sql

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+-- Get all pairs of actors that worked together.
+select f1.actor_id as Actor_1, f2.actor_id as Actor_2, f1.film_id
+from sakila.film_actor f1
+inner join sakila.film_actor f2
+on f1.film_id = f2.film_id
+and f2.actor_id <> f1.actor_id
+order by f1.film_id;
+
+-- Get all pairs of customers that have rented the same film more than 3 times.
+select distinct c.customer_id as Customer_1, c2.customer_id as Customer_2, count(*) as same_films
+from sakila.customer c
+inner join sakila.rental r
+on c.customer_id = r.customer_id
+inner join sakila.inventory i
+on r.inventory_id = i.inventory_id
+inner join sakila.inventory i2
+on i.film_id = i2.film_id
+inner join sakila.rental r2
+on r2.inventory_id = i2.inventory_id
+inner join sakila.customer c2
+on c2.customer_id = r2.customer_id
+and c.customer_id <> c2.customer_id
+group by 1,2
+having same_films > 3
+order by same_films desc;
+
+
+-- Get all possible pairs of actors and films
+select concat(first_name, ' ', last_name) as actor_full_name, title as film_title from sakila.actor
+cross join sakila.film;