[lab_stored_procedures] Elissa de Jong

Solutions.sql

@@ -1,18 +1,64 @@
---
--- Create a stored procedure that finds first name, last name, and emails of all the customers who rented `Action movies.
--- 
-
---
--- 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.
---
-
-
---
--- Write a query to check the number of movies released in each movie category.
---
-
---
+USE sakila;
+-- Convert the query into a simple stored procedure. Use the following query:
+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;
+-- Stored procedure:
+DROP PROCEDURE customers_rented_movies_category;
+DELIMITER //
+CREATE PROCEDURE customers_rented_movies_category()
+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 customers_rented_movies_category();
+-- Now keep working on the previous stored procedure to make it more dynamic. 
+-- 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. 
+-- For eg., it could be action, animation, children, classics, etc.
+DROP PROCEDURE customers_rented_movies_category;
+DELIMITER //
+CREATE PROCEDURE customers_rented_movies_category(in param1 varchar(20))
+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 COLLATE utf8mb4_general_ci = param1
+GROUP BY first_name, last_name, email;
+END //
+DELIMITER ;
+CALL customers_rented_movies_category("Animation");
+-- Write a query to check the number of movies released in each movie category. 
+SELECT category_id, COUNT(film_id) AS cat_num_released
+FROM film_category
+GROUP BY category_id;
 -- Convert the query in to a stored procedure to filter only those categories that have movies released greater than a certain number. 
+DROP PROCEDURE more_movies_released;
+DELIMITER //
+CREATE PROCEDURE more_movies_released(in param1 int)
+BEGIN
+SELECT category_id, COUNT(film_id) AS cat_num_released
+FROM film_category
+GROUP BY category_id
+HAVING cat_num_released > param1;
+END //
+DELIMITER ;
 -- Pass that number as an argument in the stored procedure.
---
+CALL more_movies_released(60);