solved_lab

Joins_lab.sql

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+USE SAKILA;
+SHOW tables;
+#1 List the number of films per category.
+SELECT 
+    c.name AS category,
+    COUNT(f.film_id) AS film_count
+FROM film AS f
+JOIN film_category AS fc 
+    ON f.film_id = fc.film_id
+JOIN category AS c 
+    ON fc.category_id = c.category_id
+GROUP BY c.name;
+#2 Retrieve the store ID, city, and country for each store.
+SELECT 
+    store.store_id,
+    city.city,
+    country.country
+FROM store
+JOIN address 
+    ON store.address_id = address.address_id
+JOIN city 
+    ON address.city_id = city.city_id
+JOIN country 
+    ON city.country_id = country.country_id;
+#3.  Calculate the total revenue generated by each store in dollars.
+SELECT store.store_id ,SUM(payment.amount) AS total_revenue
+FROM store
+JOIN customer
+    ON store.store_id=customer.store_id
+JOIN payment
+    ON customer.customer_id=payment.customer_id
+GROUP BY store.store_id;    
+# Determine the average running time of films for each category.
+SELECT 
+    category.name AS category_name,
+    ROUND(AVG(film.length), 2) AS avg_running_time
+FROM film
+JOIN film_category
+    ON film.film_id = film_category.film_id
+JOIN category
+    ON film_category.category_id = category.category_id
+GROUP BY category.name
+ORDER BY avg_running_time DESC;
+## Display the top 10 most frequently rented movies in descending order.
+SELECT 
+film.title
+FROM film
+JOIN inventory
+     ON film.film_id=inventory.film_id
+JOIN rental
+      ON inventory.inventory_id=rental.inventory_id
+GROUP BY film.title
+ORDER BY title desc
+LIMIT 10;      
+##Determine if "Academy Dinosaur" can be rented from Store 1.
+SELECT 
+    film.title,
+    inventory.store_id,
+    CASE 
+        WHEN rental.rental_id IS NULL THEN 'Available'
+        ELSE 'Not Available'
+    END AS availability_status
+FROM film
+JOIN inventory 
+    ON film.film_id = inventory.film_id
+LEFT JOIN rental 
+    ON inventory.inventory_id = rental.inventory_id
+    AND rental.return_date IS NULL
+WHERE film.title = 'ACADEMY DINOSAUR'
+AND inventory.store_id = 1;
+
+SELECT 
+    film.title,
+    CASE 
+        WHEN COUNT(inventory.inventory_id) = 0 THEN 'NOT available'
+        ELSE 'Available'
+    END AS availability_status
+FROM film
+LEFT JOIN inventory 
+    ON film.film_id = inventory.film_id
+GROUP BY film.title;