[lab-sql-self-cross-join] Fabiana Ferraz

lab-sql-self-cross-join.sql

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+-- Get all pairs of actors that worked together.
+SELECT 
+CONCAT(A.first_name, ' ', A.last_name) AS actor1,
+CONCAT(B.first_name, ' ', B.last_name) AS actor2,
+A.title 
+FROM 
+    (SELECT 
+        fa.actor_id, 
+        a.first_name, 
+        a.last_name, 
+        fa.film_id, 
+        f.title
+    FROM sakila.actor a 
+    INNER JOIN sakila.film_actor fa ON a.actor_id = fa.actor_id
+    INNER JOIN sakila.film f ON fa.film_id = f.film_id
+    ) AS A
+INNER JOIN 
+    (SELECT 
+        fa.actor_id, 
+        a.first_name, 
+        a.last_name, 
+        fa.film_id, 
+        f.title
+    FROM sakila.actor a 
+    INNER JOIN sakila.film_actor fa ON a.actor_id = fa.actor_id
+    INNER JOIN sakila.film f ON fa.film_id = f.film_id
+    ) AS B 
+ON A.film_id = B.film_id
+AND A.actor_id < B.actor_id
+ORDER BY A.title;
+
+-- Get all pairs of customers that have rented the same film more than 3 times.
+SELECT
+A.title as film_title,
+CONCAT(A.first_name, ' ', A.last_name) AS customer1,
+CONCAT(B.first_name, ' ', B.last_name) AS customer2,
+COUNT(*) AS rental_count
+FROM 
+    (SELECT 
+        c.customer_id, 
+        c.first_name, 
+        c.last_name, 
+        r.inventory_id, 
+        f.title
+    FROM sakila.customer c 
+    INNER JOIN sakila.rental r ON c.customer_id = r.customer_id
+    INNER JOIN sakila.inventory inv ON r.inventory_id = inv.inventory_id
+    INNER JOIN sakila.film f ON inv.film_id = f.film_id
+    ) AS A
+INNER JOIN 
+    (SELECT 
+        c.customer_id, 
+        c.first_name, 
+        c.last_name, 
+        r.inventory_id, 
+        f.title
+    FROM sakila.customer c 
+    INNER JOIN sakila.rental r ON c.customer_id = r.customer_id
+    INNER JOIN sakila.inventory inv ON r.inventory_id = inv.inventory_id
+    INNER JOIN sakila.film f ON inv.film_id = f.film_id
+    ) AS B 
+ON A.title = B.title
+AND A.customer_id < B.customer_id 
+GROUP BY 1,2,3
+HAVING rental_count > 3
+ORDER BY rental_count;
+
+-- Get all possible pairs of actors and films.
+SELECT 
+a.actor_id AS actor_id,
+concat (a.first_name, ' ', a.last_name) AS actor_name,
+f.film_id AS film_id,
+f.title AS film_title
+FROM sakila.actor a
+CROSS JOIN sakila.film f
+ORDER BY actor_id, film_id;