[lab-stored-procedures] Izel

Lab stored procedures.sql

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+use sakila;
+
+-- Create a stored procedure that finds first name, last name, and emails of all the customers who rented `Action movies.
+drop procedure if exists cust_action;
+
+delimiter // 
+create procedure cust_action(out params1 varchar(50))
+begin
+select CONCAT(c.first_name, ' ', c.last_name) AS customer_name, c.email into params1
+from rental r
+join customer c
+on c.customer_id = r.customer_id
+join inventory i
+on r.inventory_id = i.inventory_id
+join film_category fc
+on i.film_id = fc.film_id
+where fc.category_id = 1
+group by c.customer_id;
+end;
+// 
+delimiter ;
+
+call cust_action(@x);
+
+
+-- 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.
+drop procedure if exists cust_cat;
+
+delimiter // 
+create procedure cust_cat(out param1 float, out cust char)
+begin
+select CONCAT(c.first_name, ' ', c.last_name) AS customer_name, c.email 
+from rental r
+join customer c
+on c.customer_id = r.customer_id
+join inventory i
+on r.inventory_id = i.inventory_id
+join film_category fc
+on i.film_id = fc.film_id
+where fc.category_id collate utf8mb4_general_ci = param1
+group by c.customer_id;
+end;
+// 
+delimiter ;
+
+call cust_cat(@1, @x);
+
+
+-- Write a query to check the number of movies released in each movie category.
+SELECT new_name, count(fc.film_id) as nb_film
+FROM film_category fc
+JOIN category c
+ON fc.category_id = c.category_id
+GROUP BY new_name;
+
+
+-- 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 nb_movie;
+
+delimiter //
+create procedure nb_movie (in param1 int, out param2 varchar(20), out param3 int)
+begin
+SELECT new_name, count(fc.film_id) as nb_film
+FROM film_category fc
+JOIN category c
+ON fc.category_id = c.category_id
+GROUP BY new_name
+having nb_film collate utf8mb4_general_ci > param1;
+end
+//
+delimiter ;
+
+call nb_movie(70, @x, @y)