solved lab

lab-sql-joins.sql

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+USE sakila;
+
+describe film_category;
+
+describe category;
+
+
+
+SELECT category.name AS category_name, COUNT(film.film_id) AS film_count
+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;
+
+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;
+
+SELECT store.store_id, SUM(payment.amount) AS total_revenue
+FROM store
+JOIN staff ON store.store_id = staff.store_id
+JOIN payment ON staff.staff_id = payment.staff_id
+GROUP BY store.store_id;
+
+select category.name, avg(film.length) as average_runtime
+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
+