From fff62933d44962283bb47d07f8f3858408188a61 Mon Sep 17 00:00:00 2001
From: Diego fornero <157987989+furby990@users.noreply.github.com>
Date: Sat, 11 Apr 2026 17:36:30 +0200
Subject: [PATCH] Add files via upload

---
 lab-sql-joins.sql | 170 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 lab-sql-joins.sql

diff --git a/lab-sql-joins.sql b/lab-sql-joins.sql
new file mode 100644
index 0000000..44ae251
--- /dev/null
+++ b/lab-sql-joins.sql
@@ -0,0 +1,170 @@
+CREATE DATABASE sakila;
+USE sakila;
+SHOW TABLES;
+
+SHOW TABLES IN sakila;
+SELECT * FROM sakila.actor;
+SELECT * FROM sakila.film;
+SELECT * FROM sakila.customer;
+SELECT title FROM sakila.film;
+SELECT title FROM film;
+SELECT first_name FROM staff;
+SELECT COUNT(*) AS total_stores FROM store;
+SELECT COUNT(*) AS total_staff FROM staff;
+SELECT COUNT(*) AS available_films FROM inventory;
+SELECT COUNT(*) AS rented_films FROM rental;
+SELECT COUNT(DISTINCT last_name) AS unique_last_names FROM actor;
+SELECT title, length
+FROM film
+ORDER BY length DESC
+LIMIT 10;
+SELECT *
+FROM actor
+WHERE first_name = 'SCARLETT';
+SELECT *
+FROM film
+WHERE title LIKE '%ARMAGEDDON%'
+AND length > 100;
+SELECT COUNT(*) AS behind_the_scenes_films
+FROM film
+WHERE special_features LIKE '%Behind the Scenes%';
+SELECT 
+    MAX(length) AS max_duration,
+    MIN(length) AS min_duration
+FROM film;
+SELECT 
+    FLOOR(AVG(length) / 60) AS hours,
+    FLOOR(AVG(length) % 60) AS minutes
+FROM film;
+SELECT 
+    DATEDIFF(MAX(rental_date), MIN(rental_date)) AS operating_days
+FROM rental;
+SELECT 
+    rental_id,
+    rental_date,
+    MONTH(rental_date) AS month,
+    DAYNAME(rental_date) AS weekday
+FROM rental
+LIMIT 20;
+SELECT 
+    rental_id,
+    rental_date,
+    DAYNAME(rental_date) AS weekday,
+    CASE 
+        WHEN DAYNAME(rental_date) IN ('Saturday', 'Sunday') THEN 'weekend'
+        ELSE 'workday'
+    END AS day_type
+FROM rental
+LIMIT 20;
+SELECT 
+    title,
+    IFNULL(rental_duration, 'Not Available') AS rental_duration
+FROM film
+ORDER BY title ASC;
+SELECT 
+    CONCAT(first_name, ' ', last_name) AS full_name,
+    SUBSTRING(email, 1, 3) AS email_prefix
+FROM customer
+ORDER BY last_name ASC;
+SELECT COUNT(*) AS total_films
+FROM film;
+SELECT 
+    rating,
+    COUNT(*) AS total
+FROM film
+GROUP BY rating;
+SELECT 
+    rating,
+    COUNT(*) AS total
+FROM film
+GROUP BY rating
+ORDER BY total DESC;
+SELECT 
+    rating,
+    ROUND(AVG(length), 2) AS avg_duration
+FROM film
+GROUP BY rating
+ORDER BY avg_duration DESC;
+SELECT 
+    rating,
+    ROUND(AVG(length), 2) AS avg_duration
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120;
+SELECT 
+    last_name
+FROM actor
+GROUP BY last_name
+HAVING COUNT(*) = 1;
+SELECT 
+    c.name AS category,
+    COUNT(fc.film_id) AS total_films
+FROM category c
+JOIN film_category fc ON c.category_id = fc.category_id
+GROUP BY c.name;
+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;
+SELECT 
+    s.store_id,
+    SUM(p.amount) AS total_revenue
+FROM payment p
+JOIN staff st ON p.staff_id = st.staff_id
+JOIN store s ON st.store_id = s.store_id
+GROUP BY s.store_id;
+SELECT 
+    c.name AS category,
+    ROUND(AVG(f.length), 2) AS avg_duration
+FROM film f
+JOIN film_category fc ON f.film_id = fc.film_id
+JOIN category c ON fc.category_id = c.category_id
+GROUP BY c.name;
+SELECT 
+    c.name AS category,
+    ROUND(AVG(f.length), 2) AS avg_duration
+FROM film f
+JOIN film_category fc ON f.film_id = fc.film_id
+JOIN category c ON fc.category_id = c.category_id
+GROUP BY c.name
+ORDER BY avg_duration DESC;
+SELECT 
+    f.title,
+    COUNT(r.rental_id) AS times_rented
+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 times_rented DESC
+LIMIT 10;
+SELECT 
+    f.title,
+    COUNT(r.rental_id) AS times_rented
+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 times_rented DESC
+LIMIT 10;
+SELECT 
+    f.title,
+    i.store_id,
+    COUNT(i.inventory_id) AS copies_available
+FROM film f
+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;
+SELECT 
+    f.title,
+    CASE 
+        WHEN COUNT(i.inventory_id) > 0 THEN 'Available'
+        ELSE 'NOT available'
+    END AS availability
+FROM film f
+LEFT JOIN inventory i ON f.film_id = i.film_id
+GROUP BY f.title;