Add files via upload

[Davi]sql-self-cross-join.sql

@@ -0,0 +1,22 @@
+-- Get all pairs of actors that worked together.
+USE SAKILA;
+SELECT DISTINCT A1.ACTOR_ID AS ACTOR_ID, A1.FIRST_NAME AS ACTOR1_FIRST_NAME, A1.LAST_NAME AS ACTOR1_LAST_NAME,
+A2.ACTOR_ID AS ACTOR2_ID, A2.FIRST_NAME AS ACTOR2_FIRST_NAME, A2.LAST_NAME AS ACTOR2_LAST_NAME
+FROM FILM_ACTOR FA1
+JOIN FILM_ACTOR FA2 ON FA1.FILM_ID = FA2.FILM_ID AND FA1.ACTOR_ID < FA2.ACTOR_ID
+JOIN ACTOR A1 ON FA1.aCTOR_ID = A1.ACTOR_ID
+JOIN ACTOR A2 ON FA2.ACTOR_ID = A2.ACTOR_ID;
+
+
+-- Get all pairs of customers that have rented the same film more than 3 times
+SELECT FILM_ID, CUSTOMER_ID
+FROM RENTAL R 
+INNER JOIN INVENTORY I
+ON R.INVENTORY_ID = I.INVENTORY_ID
+GROUP BY FILM_ID, CUSTOMER_ID
+HAVING COUNT(*) >= 3;
+
+-- Get all possible pairs of actors and films.
+SELECT A.ACTOR_ID, A.FIRST_NAME, A.LAST_NAME, F.FILM_ID, F.TITLE
+FROM ACTOR A
+CROSS JOIN FILM F;