Staff fix

lab-sql-joins.sql

@@ -0,0 +1,45 @@
+USE Sakila
+
+-- 1 films per category
+SELECT 
+	category.name,
+    COUNT(film_category.film_id) AS number_of_films
+FROM  film_category
+JOIN category
+	ON film_category.category_id = category.category_id
+GROUP BY category.name;
+
+-- 2 STORE location
+SELECT
+	store.store_id,
+    address.address,
+    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 Revenue per store
+SELECT
+	staff.store_id,
+    SUM(payment.amount) AS revenue
+FROM staff
+JOIN payment
+	ON staff.staff_id = payment.staff_id
+GROUP BY staff.store_id;
+
+-- 4 AVG running time of fils 4 each cat
+
+SELECT
+	category.name,
+	ROUND(AVG(film.length)) AS avg_runing_time
+FROM film_category
+JOIN film
+	ON film_category.film_id = film.film_id
+JOIN category
+	ON film_category.category_id= category.category_id 
+GROUP BY category.name;