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

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

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+-- 1. Get all pairs of actors that worked together.
+select fa1.film_id, fa2.actor_id
+from sakila.film_actor fa1
+inner join sakila.film_actor fa2
+on fa1.film_id = fa2.film_id
+and fa1.actor_id <> fa2.actor_id
+;
+
+-- 2. Get all pairs of customers that have rented the same film more than 3 times.
+-- (each pair of customers that rented more than 3 films in comun
+
+select c1.customer_id, c2.customer_id, count(*) as count
+from sakila.customer c1
+inner join sakila.rental r1 on c1.customer_id = r1.customer_id
+inner join sakila.inventory i1 on r1.inventory_id = i1.inventory_id
+inner join sakila.film f1 on i1.film_id = f1.film_id
+inner join sakila.inventory i2 on f1.film_id = i2.film_id
+inner join sakila.rental r2 on i2.inventory_id = r2.inventory_id
+inner join sakila.customer c2 on c2.customer_id = r2.customer_id
+where c1.customer_id <> c2.customer_id and c1.customer_id < c2.customer_id
+group by 1,2
+having count > 3
+order by 3 desc
+;
+
+
+
+
+
+-- 3. Get all possible pairs of actors and films
+select concat(a.first_name, ' ', a.last_name) as name, f.title
+from sakila.actor a
+cross join sakila.film f
+;