Create lab4.sql

lab4.sql

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+-- LAB | SQL Joins
+-- SQL Joins Lab for Sakila Database
+
+-- 1. List the number of films per category.
+SELECT 
+    c.name AS category_name,
+    COUNT(f.film_id) AS number_of_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.category_id, c.name;
+
+-- 2. Retrieve the store ID, city, and country for each store.
+SELECT 
+    s.store_id,
+    a.city,
+    co.country
+FROM 
+    store s
+JOIN 
+    address a ON s.address_id = a.address_id
+JOIN 
+    city ci ON a.city_id = ci.city_id
+JOIN 
+    country co ON ci.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 
+    staff st ON s.store_id = st.store_id
+JOIN 
+    payment p ON st.staff_id = p.staff_id  -- Fixed join logic
+GROUP BY 
+    s.store_id;
+
+-- 4. Determine the average running time of films for each category.
+SELECT 
+    c.name AS category_name,
+    ROUND(AVG(f.length), 2) AS average_running_time  -- Rounded to two decimal places
+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.category_id, c.name;
+
+-- Bonus: Identify the film categories with the longest average running time.
+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.category_id, c.name
+ORDER BY 
+    average_running_time DESC
+LIMIT 1;  -- Only show the category with the longest average
+
+-- Bonus: Display the top 10 most frequently rented movies in descending order.
+SELECT 
+    f.title,
+    COUNT(r.rental_id) AS rental_count
+FROM 
+    film f
+JOIN 
+    inventory i ON f.film_id = i.film_id
+JOIN 
+    rental r ON i.inventory_id = r.inventory_id
+GROUP BY 
+    f.film_id, f.title
+ORDER BY 
+    rental_count DESC
+LIMIT 10;
+
+-- Bonus: Determine if "Academy Dinosaur" can be rented from Store 1.
+SELECT 
+    f.title,
+    CASE 
+        WHEN i.inventory_id IS NOT NULL THEN 'Available'
+        ELSE 'NOT available'
+    END AS availability
+FROM 
+    film f
+LEFT JOIN 
+    inventory i ON f.film_id = i.film_id AND i.store_id = 1
+WHERE 
+    f.title = 'Academy Dinosaur';
+
+-- Bonus: Provide a list of all distinct film titles with availability status.
+SELECT 
+    f.title,
+    CASE 
+        WHEN i.inventory_id IS NOT NULL THEN 'Available'
+        ELSE 'NOT available'
+    END AS availability_status
+FROM 
+    film f
+LEFT JOIN 
+    inventory i ON f.film_id = i.film_id
+GROUP BY 
+    f.film_id, f.title;  -- Added this query