done

lab_sql_joins.sql

@@ -0,0 +1,52 @@
+# Challenge 1
+
+SELECT category.name, SUM(film_category.film_id)
+FROM film_category
+LEFT JOIN category
+ON film_category.category_id = category.category_id
+GROUP BY category.name
+ORDER BY category.name;
+
+# Challenge 2
+
+SELECT 
+	store.store_id, 
+    city.city,
+    country.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;
+
+# Challenge 3
+
+SELECT
+	store.store_id,
+    SUM(payment.amount)
+FROM store
+LEFT JOIN customer ON store.store_id = customer.store_id
+LEFT JOIN payment ON customer.customer_id = payment.customer_id
+GROUP BY store.store_id;
+
+# Challenge 4/5
+
+SELECT
+	category.name,
+    AVG(film.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
+ORDER BY AVG(film.length) desc;
+
+# Challenge 7
+
+SELECT
+	film.title,
+    store.store_id
+FROM film
+LEFT JOIN inventory ON film.film_id = inventory.film_id
+LEFT JOIN store ON inventory.store_id = store.store_id
+WHERE film.title = "Academy Dinosaur";
+
+