Silvia l Stored Procedures

Solutions.sql

@@ -1,18 +1,55 @@
---
--- Create a stored procedure that finds first name, last name, and emails of all the customers who rented `Action movies.
--- 
+USE sakila;
 
---
--- Update the stored procedure in a such manner that it can take a string argument for the category name and return 
--- the results for all customers that rented movie of that category/genre.
---
+# First part
+DELIMITER //
+CREATE PROCEDURE action_customers()
+BEGIN
+  select first_name, last_name, email
+  from customer
+  join rental on customer.customer_id = rental.customer_id
+  join inventory on rental.inventory_id = inventory.inventory_id
+  join film on film.film_id = inventory.film_id
+  join film_category on film_category.film_id = film.film_id
+  join category on category.category_id = film_category.category_id
+  where category.name = "Action"
+  group by first_name, last_name, email;
+END
+//
+DELIMITER ;
 
+CALL action_customers();
 
---
--- Write a query to check the number of movies released in each movie category.
---
+# Second part
+DELIMITER //
+CREATE PROCEDURE r_category(in cat varchar(30))
+BEGIN
+	select first_name, last_name, email
+	from customer
+	join rental on customer.customer_id = rental.customer_id
+	join inventory on rental.inventory_id = inventory.inventory_id
+	join film on film.film_id = inventory.film_id
+	join film_category on film_category.film_id = film.film_id
+	join category on category.category_id = film_category.category_id
+	where category.name = cat
+	group by first_name, last_name, email;
+END
+//
+DELIMITER ;
 
---
--- Convert the query in to a stored procedure to filter only those categories that have movies released greater than a certain number. 
--- Pass that number as an argument in the stored procedure.
---
+CALL r_category("Action");
+
+# Third part
+drop procedure if exists film_cat;
+DELIMITER //
+CREATE PROCEDURE film_cat(in number int)
+BEGIN
+	select c.name, count(fc.film_id) as n_films
+	from film_category fc
+	join category c on fc.category_id = c.category_id
+	group by c.name
+	having n_films > number;
+END
+//
+DELIMITER ;
+
+CALL film_cat(40);