Create Lab_SQL_joins.sql

Lab_SQL_joins.sql

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+USE sakila;
+
+-- 1. List the number of films per category.
+SELECT count(*) AS total_films, category.name 
+FROM category
+LEFT JOIN film_category
+
+ON category.category_id = film_category.category_id
+LEFT JOIN film
+ON film_category.film_id=film.film_id
+GROUP BY category.name;
+
+-- 2. Retrieve the store ID, city, and country for each store.
+
+SELECT store_id, city, country
+FROM store
+LEFT JOIN address
+ON store.address_id = address.address_id
+LEFT JOIN city 
+ON address.city_id = city.city_id
+LEFT 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_amount
+FROM store
+LEFT JOIN staff
+ON store.store_id = staff.store_id
+LEFT JOIN payment
+ON staff.staff_id = payment.staff_id
+GROUP BY store.store_id;
+-- 4. Determine the average running time of films for each category.
+SELECT category.name AS category_name, round(AVG(length),1) AS Average_length
+FROM category
+LEFT join film_category
+ON category.category_id = film_category.category_id
+LEFT JOIN film
+ON film_category.film_id = film.film_id
+GROUP BY category.name;