Solved lab

labsql4.sql

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+-- 1. List the number of films per category.
+
+SELECT 
+    c.name AS category_name,
+    COUNT(f.film_id) AS total_films
+FROM 
+    category c
+JOIN 
+    film_category fc ON c.category_id = fc.category_id
+JOIN 
+    film f ON fc.film_id = f.film_id
+GROUP BY 
+    c.name;
+
+-- 2. Retrieve the store ID, city, and country for each store.
+
+SELECT 
+    s.store_id,
+    c.city,
+    co.country
+FROM 
+    store s
+JOIN 
+    address a ON s.address_id = a.address_id
+JOIN 
+    city c ON a.city_id = c.city_id
+JOIN 
+    country co ON c.country_id = co.country_id;
+
+-- 3.  Calculate the total revenue generated by each store in dollars.
+
+SELECT 
+    s.store_id,
+    SUM(p.amount) AS total_revenue
+FROM 
+    store s
+JOIN 
+    inventory i ON s.store_id = i.store_id
+JOIN 
+    rental r ON i.inventory_id = r.inventory_id
+JOIN 
+    payment p ON r.rental_id = p.rental_id
+GROUP BY 
+    s.store_id;
+
+-- 4.  Determine the average running time of films for each category.
+
+SELECT 
+    c.name AS category_name,
+    AVG(f.length) AS average_running_time
+FROM 
+    category c
+JOIN 
+    film_category fc ON c.category_id = fc.category_id
+JOIN 
+    film f ON fc.film_id = f.film_id
+GROUP BY 
+    c.name;
+