week 4 lab 4 done

joins_lab.sql

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+USE sakila;
+-- 1
+SELECT c.name AS category_name, COUNT(fc.film_id) AS film_count
+FROM film_category fc
+JOIN category c ON fc.category_id = c.category_id
+GROUP BY c.name;
+-- 2
+SELECT s.store_id, ci.city, co.country
+FROM store s
+JOIN address a ON s.address_id = a.address_id
+JOIN city ci ON a.city_id = ci.city_id
+JOIN country co ON ci.country_id = co.country_id;
+-- 3
+SELECT s.store_id, SUM(p.amount) AS total_revenue
+FROM payment p
+JOIN rental r ON p.rental_id = r.rental_id
+JOIN inventory i ON r.inventory_id = i.inventory_id
+JOIN store s ON i.store_id = s.store_id
+GROUP BY s.store_id;
+-- 4
+SELECT c.name AS category_name, AVG(f.length) AS avg_length
+FROM film f
+JOIN film_category fc ON f.film_id = fc.film_id
+JOIN category c ON fc.category_id = c.category_id
+GROUP BY c.name;
+-- 5
+SELECT c.name AS category_name, AVG(f.length) AS avg_length
+FROM film f
+JOIN film_category fc ON f.film_id = fc.film_id
+JOIN category c ON fc.category_id = c.category_id
+GROUP BY c.name
+ORDER BY avg_length DESC;
+-- 6
+SELECT f.title, COUNT(r.rental_id) AS rental_count
+FROM rental r
+JOIN inventory i ON r.inventory_id = i.inventory_id
+JOIN film f ON i.film_id = f.film_id
+GROUP BY f.title
+ORDER BY rental_count DESC
+LIMIT 10;
+-- 7
+SELECT CASE WHEN COUNT(i.inventory_id) > 0 THEN 'Available' ELSE 'Not Available'
+       END AS availability
+FROM film f
+JOIN inventory i ON f.film_id = i.film_id
+WHERE f.title = 'Academy Dinosaur' AND i.store_id = 1;
+-- 8
+SELECT f.title, CASE WHEN COUNT(i.inventory_id) > 0 THEN 'Available' ELSE 'NOT available'
+       END AS availability_status
+FROM film f
+LEFT JOIN inventory i ON f.film_id = i.film_id AND i.store_id IS NOT NULL
+GROUP BY f.title;