From e938eb53174df27ae045f78f39085032e800089c Mon Sep 17 00:00:00 2001
From: Shilpa Vellore Krishnamurthy <vkshilpa106@gmail.com>
Date: Thu, 9 Jul 2026 00:02:25 +0200
Subject: [PATCH] sqllab4 done

---
 lab 4.sql | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 lab 4.sql

diff --git a/lab 4.sql b/lab 4.sql
new file mode 100644
index 0000000..6a784b8
--- /dev/null
+++ b/lab 4.sql	
@@ -0,0 +1,114 @@
+use Sakila;
+
+-- List the number of films per category.
+
+select count(film_id) as Total_film from film;
+
+SELECT rating, COUNT(film_id) AS number_of_films
+FROM film
+GROUP BY rating
+order by desc;category
+
+--  or 
+use sakila;
+select category_id from 
+
+SELECT 
+    c.name AS category_name, 
+    COUNT(fc.film_id) AS number_of_films
+FROM category c
+INNER JOIN film_category fc ON c.category_id = fc.category_id
+GROUP BY c.name;
+
+-- 2. Retrieve the store ID, city, and country for each store
+
+SELECT 
+    s.store_id, 
+    ci.city, 
+    co.country
+FROM store s
+INNER JOIN address a ON s.address_id = a.address_id
+INNER JOIN city ci ON a.city_id = ci.city_id
+INNER 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_dollars
+FROM store s
+INNER JOIN staff st ON s.store_id = st.store_id
+INNER JOIN payment p ON st.staff_id = p.staff_id
+GROUP BY s.store_id;
+
+--  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
+FROM category c
+INNER JOIN film_category fc ON c.category_id = fc.category_id
+INNER JOIN film f ON fc.film_id = f.film_id
+GROUP BY c.name;
+
+-- Identify the film categories with the longest average running time
+
+SELECT 
+    c.name AS category_name, 
+    ROUND(AVG(f.length), 2) AS average_running_time
+FROM category c
+INNER JOIN film_category fc ON c.category_id = fc.category_id
+INNER JOIN film f ON fc.film_id = f.film_id
+GROUP BY c.name
+ORDER BY average_running_time DESC
+LIMIT 1;
+
+
+-- Display the top 10 most frequently rented movies in descending order
+
+SELECT 
+    f.title, 
+    COUNT(r.rental_id) AS rental_count
+FROM film f
+INNER JOIN inventory i ON f.film_id = i.film_id
+INNER JOIN rental r ON i.inventory_id = r.inventory_id
+GROUP BY f.title
+ORDER BY rental_count DESC
+LIMIT 10;
+
+-- Determine if "Academy Dinosaur" can be rented from Store 1
+SELECT 
+    f.title, 
+    i.store_id, 
+    COUNT(i.inventory_id) AS copies_in_stock
+FROM film f
+INNER JOIN inventory i ON f.film_id = i.film_id
+WHERE f.title = 'Academy Dinosaur' AND i.store_id = 1
+GROUP BY f.title, i.store_id;
+
+--  Title availability list (Handling the 42 missing items via CASE and IFNULL)
+
+SELECT 
+    f.title,
+    CASE 
+        WHEN IFNULL(i.inventory_id, 0) = 0 THEN 'NOT available'
+        ELSE 'Available'
+    END AS availability_status
+FROM film f
+LEFT JOIN inventory i ON f.film_id = i.film_id
+GROUP BY f.title, availability_status;
+
+
+
+
+
+
+
+
+
+
+-- Retrieve the store ID, city, and country for each store.
+
+
+
+-- Calculate the total revenue generated by each store in dollars.
+-- Determine the average running time of films for each category.