solved

basic queries.sql

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+USE sakila;
+
+SELECT COUNT(*) FROM film;
+SELECT COUNT(*) FROM film_text;
+-- 1) display all tables
+SHOW FULL TABLES;
+
+-- 2)  Retrieve all the data from the tables actor, film and customer.
+SELECT * FROM actor, film, customer;
+
+/*Retrieve the following columns from their respective tables:
+	- 3.1 Titles of all films from the `film` table
+	- 3.2 List of languages used in films, with the column aliased as `language` from the `language` table
+	- 3.3 List of first names of all employees from the `staff` table*/
+SELECT title FROM film;
+
+select f.title, l.name as language
+from sakila.film f inner join sakila.language l on f.language_id = l.language_id;
+
+SELECT first_name from staff;
+
+-- 4 Retrieve unique release years.
+SELECT DISTINCT release_year from film
+
+/* Counting records for database insights:
+
+5.1 Determine the number of stores that the company has.
+5.2 Determine the number of employees that the company has.
+5.3 Determine how many films are available for rent and how many have been rented.
+5.4 Determine the number of distinct last names of the actors in the database.*/
+
+SELECT COUNT(*) from store; 
+SELECT COUNT(*) from staff; 
+
+-- Asumimos que todas las películas están alquiladas a día de hoy en tabla rental
+SELECT
+    (SELECT COUNT(*) 
+     FROM inventory)                      AS films_available_for_rent,
+    (SELECT COUNT(DISTINCT inventory_id)  
+     FROM rental)                         AS films_rented;inventory
+
+SELECT COUNT(distinct last_name) from actor;
+
+-- 6. Retrieve the 10 longest films.
+SELECT title, length
+FROM film
+ORDER BY length DESC
+LIMIT 10;
+
+-
+-- 7.1 Retrieve all actors with the first name "SCARLETT".
+SELECT * FROM actor WHERE first_name = 'SCARLETT';
+
+-- 7.2 Retrieve all movies that have ARMAGEDDON in their title and have a duration longer than 100 minutes.
+SELECT * 
+FROM film
+WHERE title LIKE '%ARMAGEDDON%' AND length > 100;
+
+-- 7.3 Determine the number of films that include Behind the Scenes content
+SELECT COUNT(*)
+from film
+WHERE special_features LIKE '%behind the scenes%'
+
+
+