Solved lab SQL Basic Queries

solutions_lab2.sql

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+-- 1 Display all available tables in the Sakila database.
+USE sakila;
+SHOW TABLES;
+
+-- 2 Retrieve all the data from the tables actor, film and customer
+SELECT * FROM actor;
+SELECT * FROM film;
+SELECT * FROM customer;
+
+-- 3 Retrieve the following columns from their respective tables:
+-- 3.1 Titles of all films from the film table
+SELECT Title FROM Film;
+-- 3.2 List of languages used in films, with the column aliased as language from the language table
+SELECT name AS language FROM language;
+
+-- 3.3 List of first names of all employees
+SELECT first_name FROM staff;
+
+
+-- 4) Retrieve unique release years.
+SELECT DISTINCT release_year
+FROM film
+ORDER BY release_year;
+
+-- 5.1) Number of stores.
+SELECT COUNT(*) AS num_stores
+FROM store;
+
+-- 5.2) Number of employees.
+SELECT COUNT(*) AS num_employees
+FROM staff;
+
+-- 5.3) How many films are available for rent AND how many have been rented at least once.
+-- Available for rent 
+SELECT COUNT(DISTINCT film_id) AS films_available_for_rent
+FROM inventory;
+
+-- Rented at least once 
+SELECT COUNT(DISTINCT i.film_id) AS films_rented
+FROM rental r
+JOIN inventory i ON r.inventory_id = i.inventory_id;
+
+-- 5.4) Number of DISTINCT actor last names.
+SELECT COUNT(DISTINCT last_name) AS distinct_actor_last_names
+FROM actor;
+
+-- 6) Retrieve the 10 longest films.
+SELECT title, length
+FROM film
+ORDER BY length DESC, title ASC
+LIMIT 10;
+
+-- 7.1) All actors with first name "SCARLETT".
+SELECT actor_id, first_name, last_name
+FROM actor
+WHERE first_name = 'SCARLETT';
+
+-- 7.2 BONUS) Movies with "ARMAGEDDON" in the title and duration > 100 minutes.
+SELECT title, length
+FROM film
+WHERE title LIKE '%ARMAGEDDON%'
+  AND length > 100;
+
+-- 7.3 BONUS) Number of films that include "Behind the Scenes" content.
+-- (special_features es un SET; usamos FIND_IN_SET para buscar el valor)
+SELECT COUNT(*) AS films_with_behind_the_scenes
+FROM film
+WHERE FIND_IN_SET('Behind the Scenes', special_features) > 0;