From 8b2e740078d537e6da5d87eacafae46bff18ff79 Mon Sep 17 00:00:00 2001
From: AnaP2020 <anarita.preto@gmail.com>
Date: Sat, 4 Jul 2026 15:06:06 +0100
Subject: [PATCH] Lab 4 unit 9 done

---
 Lab 4.sql | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Lab 4.sql

diff --git a/Lab 4.sql b/Lab 4.sql
new file mode 100644
index 0000000..af5895c
--- /dev/null
+++ b/Lab 4.sql	
@@ -0,0 +1,110 @@
+-- List the Number of Films per Category
+USE sakila;
+
+SELECT 
+    c.name AS category_name, 
+    COUNT(fc.film_id) AS number_of_films
+FROM 
+    category c
+JOIN 
+    film_category fc ON c.category_id = fc.category_id
+GROUP BY 
+    c.name;
+    
+-- Retrieving the Store ID, City, and Country for Each Store
+SELECT 
+    s.store_id, 
+    ci.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;
+    
+-- Calculating the Total Revenue Generated by Each Store
+
+SELECT 
+    st.store_id, 
+    SUM(p.amount) AS total_revenue
+FROM 
+    store st
+JOIN 
+    staff stf ON st.store_id = stf.store_id
+JOIN 
+    payment p ON stf.staff_id = p.staff_id
+GROUP BY 
+    st.store_id;
+    
+-- Determining 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;
+    
+-- Identifying 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.name
+ORDER BY 
+    average_running_time DESC
+LIMIT 1;
+
+-- Displaying the Top 10 Most Frequently Rented Movies
+
+SELECT 
+    f.title, 
+    COUNT(*) AS rental_count
+FROM 
+    rental r
+JOIN 
+    inventory i ON r.inventory_id = i.inventory_id
+JOIN 
+    film f ON i.film_id = f.film_id
+GROUP BY 
+    f.title
+ORDER BY 
+    rental_count DESC
+LIMIT 10;
+
+-- Determining if "Academy Dinosaur" Can Be Rented from Store 1
+SELECT 
+    COUNT(*) AS is_available
+FROM 
+    inventory i
+JOIN 
+    film f ON i.film_id = f.film_id
+JOIN 
+    store s ON i.store_id = s.store_id
+WHERE 
+    f.title = 'Academy Dinosaur' AND s.store_id = 1;
+    
+-- Listing all Distinct Film Titles and Their Availability
+SELECT 
+    f.title, 
+    CASE WHEN IFNULL(i.inventory_id, 0) = 0 THEN 'NOT Available' ELSE 'Available' END AS availability
+FROM 
+    film f
+LEFT JOIN 
+    inventory i ON f.film_id = i.film_id
+GROUP BY 
+    f.title, i.inventory_id;
\ No newline at end of file