done lab

joins.sql

@@ -0,0 +1,82 @@
+SELECT
+    category.name AS category_name,
+    COUNT(film_category.film_id) AS number_of_films
+FROM category
+INNER JOIN film_category
+    ON category.category_id = film_category.category_id
+GROUP BY category.name
+ORDER BY number_of_films DESC;
+
+
+SELECT
+    store.store_id,
+    city.city,
+    country.country
+FROM store
+INNER JOIN address
+    ON store.address_id = address.address_id
+INNER JOIN city
+    ON address.city_id = city.city_id
+INNER JOIN country
+    ON city.country_id = country.country_id
+ORDER BY store.store_id;
+
+
+SELECT
+    store.store_id,
+    ROUND(SUM(payment.amount), 2) AS total_revenue_dollars
+FROM store
+INNER JOIN staff
+    ON store.store_id = staff.store_id
+INNER JOIN payment
+    ON staff.staff_id = payment.staff_id
+GROUP BY store.store_id
+ORDER BY total_revenue_dollars DESC;
+
+
+SELECT
+    category.name AS category_name,
+    ROUND(AVG(film.length), 2) AS average_running_time_minutes
+FROM category
+INNER JOIN film_category
+    ON category.category_id = film_category.category_id
+INNER JOIN film
+    ON film_category.film_id = film.film_id
+GROUP BY category.name
+ORDER BY average_running_time_minutes DESC;
+
+
+SELECT
+    film.title,
+    COUNT(rental.rental_id) AS number_of_rentals
+FROM film
+INNER JOIN inventory
+    ON film.film_id = inventory.film_id
+INNER JOIN rental
+    ON inventory.inventory_id = rental.inventory_id
+GROUP BY film.title
+ORDER BY number_of_rentals DESC
+LIMIT 10;
+
+
+SELECT
+    film.title,
+    COUNT(inventory.inventory_id) AS copies_in_store_1
+FROM film
+INNER JOIN inventory
+    ON film.film_id = inventory.film_id
+WHERE film.title = 'ACADEMY DINOSAUR'
+  AND inventory.store_id = 1
+GROUP BY film.title;
+
+SELECT
+    film.title,
+    CASE
+        WHEN IFNULL(COUNT(inventory.inventory_id), 0) > 0 THEN 'Available'
+        ELSE 'NOT available'
+    END AS availability_status
+FROM film
+LEFT JOIN inventory
+    ON film.film_id = inventory.film_id
+GROUP BY film.film_id, film.title
+ORDER BY film.title ASC;