[lab-stored-procedures] Charlotte

Solutions.sql

@@ -1,18 +1,80 @@
---
--- Create a stored procedure that finds first name, last name, and emails of all the customers who rented `Action movies.
--- 
+  USE sakila; 
+
+  -- 1. Create a stored procedure that finds first name, last name, and emails of all the customers who rented `Action movies.
+DELIMITER //
+CREATE PROCEDURE action_movie (OUT customers CHAR)
+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 ;
 
---
--- 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.
---
+call action_movie(@x);
+
+
+  -- 2. 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 if exists genre_guide;
 
+  delimiter // 
+  CREATE PROCEDURE genre_guide(in param1 varchar(9), OUT customers CHAR)
+  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 = param1
+  group by first_name, last_name, email;
+  END; 
+  // 
+  DELIMITER ; 
+
+CALL genre_guide('Action', @x);
+-- Action 510 rows 
+CALL genre_guide('Children', @x);
+-- Children 482 rows
+CALL genre_guide('Animation', @x);
+-- Animation 500 rows 
 
---
--- Write a query to check the number of movies released in each movie category.
---
+-- 3. Write a query to check the number of movies released in each movie category. 
 
---
--- Convert the query in to a stored procedure to filter only those categories that have movies released greater than a certain number. 
+
+SELECT name, sum(fc.film_id) as movies
+FROM film_category fc
+JOIN category c
+ON fc.category_id = c.category_id
+GROUP BY name;
+
+-- 4. 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.
---
+
+drop procedure if exists film_category;
+
+DELIMITER //
+CREATE PROCEDURE film_category (in param1 varchar(20), OUT releases INT)
+BEGIN
+SELECT * FROM (SELECT name as category, SUM(fc.film_id) as movies
+FROM film_category fc
+JOIN category c
+ON fc.category_id = c.category_id
+GROUP BY name) as movie_table
+WHERE movies > param1;
+END;
+  // 
+DELIMITER ;
+
+call film_category(35000, @x);
+-- 35000 => 3 rows