Create lab-sql-joins.sql

lab-sql-joins.sql

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+-- Write SQL queries to perform the following tasks using the Sakila database:
+
+-- 1. List the number of films per category.
+
+SELECT c.name, COUNT(f.film_id) AS numero_peliculas
+FROM category c
+JOIN film_category fc
+ON c.category_id = fc.category_id
+JOIN film f
+ON fc.film_id = f.film_id
+GROUP BY c.name;
+
+-- 2.Retrieve the store ID, city, and country for each store.
+SELECT s.store_id, c.city, co.country
+FROM city c
+JOIN address a
+ON c.city_id = a.city_id
+JOIN country co
+ON c.country_id = co.country_id
+JOIN store s
+ON a.address_id = s.address_id;
+
+-- 3.Calculate the total revenue generated by each store in dollars.
+SELECT s.store_id, SUM(p.amount)
+FROM payment p 
+JOIN staff st
+ON p.staff_id = st.staff_id
+JOIN store s
+ON st.store_id = s.store_id
+GROUP BY s.store_id;
+
+-- 4. Determine the average running time of films for each category.
+SELECT c.name, AVG(length) AS average_running
+FROM category c
+JOIN film_category fc
+ON c.category_id = fc.category_id
+JOIN film f
+ON fc.film_id = f.film_id
+GROUP BY c.name
+ORDER BY average_running DESC;
+
+
+-- Bonus:
+
+-- 5 . Identify the film categories with the longest average running time.
+SELECT c.name, AVG(length) AS average_running
+FROM category c
+JOIN film_category fc
+ON c.category_id = fc.category_id
+JOIN film f
+ON fc.film_id = f.film_id
+GROUP BY c.name
+ORDER BY average_running ASC;
+
+-- 6. Display the top 10 most frequently rented movies in descending order.
+SELECT f.title, COUNT(i.inventory_id) as film_count
+FROM film f
+JOIN inventory i
+ON f.film_id = i.film_id
+JOIN rental r
+ON i.inventory_id = r.inventory_id
+GROUP BY f.title
+ORDER BY film_count DESC
+LIMIT 10;
+
+-- 7. Determine if "Academy Dinosaur" can be rented from Store 1.
+SELECT
+	f.title,
+	CASE 
+		WHEN r.return_date IS NULL THEN 'Not available'
+		ELSE 'Available'
+	END AS status_film,
+    COUNT(*) AS count_status
+FROM film f
+JOIN inventory i
+ON f.film_id = i.film_id 
+JOIN store s
+ON i.store_id = s.store_id
+LEFT JOIN rental r
+ON i.inventory_id = r.inventory_id
+WHERE title = 'Academy Dinosaur'
+GROUP BY status_film;
+
+
+-- 8. Provide a list of all distinct film titles, along with their availability status in the inventory. 
+-- Include a column indicating whether each title is 'Available' or 'NOT available.' 
+-- Note that there are 42 titles that are not in the inventory, and this information can be obtained using a CASE statement combined with IFNULL."
+
+SELECT
+	f.title,
+	CASE 
+		WHEN r.return_date IS NULL THEN 'Not available'
+		ELSE 'Available'
+	END AS status_film,
+    COUNT(*) AS count_status
+FROM film f
+JOIN inventory i
+ON f.film_id = i.film_id 
+JOIN store s
+ON i.store_id = s.store_id
+LEFT JOIN rental r
+ON i.inventory_id = r.inventory_id
+GROUP BY f.title, status_film;