Solved lab

lab-sql-basic-queries.sql

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+USE sakila;
+
+-- 1. Display all available tables in the Sakila database.
+SHOW TABLES;
+
+-- 2. Retrieve all the data from the tables actor, film and customer.
+SELECT * FROM actor;
+SELECT * FROM film;
+SELECT * FROM customer;
+
+-- 3.1 Titles of all films
+SELECT title FROM film;
+
+-- 3.2 List of languages, aliased as `language`
+SELECT name AS language FROM language;
+
+-- 3.3 First names of all employees from the staff table
+SELECT first_name FROM staff;
+
+-- 4. Retrieve unique release years.
+SELECT DISTINCT release_year FROM film;
+
+-- 5.1 Number of stores
+SELECT COUNT(*) AS number_of_stores FROM store;
+
+-- 5.2 Number of employees
+SELECT COUNT(*) AS number_of_employees FROM staff;
+
+-- 5.3 How many films are available for rent, and how many have been rented
+-- "available for rent" = distinct films that exist in inventory (a copy exists to rent)
+-- "have been rented" = distinct films that show up in the rental history at least once
+SELECT COUNT(DISTINCT film_id) AS films_available_for_rent
+FROM inventory;
+
+SELECT COUNT(DISTINCT inventory.film_id) AS films_rented_at_least_once
+FROM rental
+JOIN inventory ON rental.inventory_id = inventory.inventory_id;
+-- both come back as 958 -- every film currently in inventory has been rented at least once
+
+-- 5.4 Number of distinct last names of actors
+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
+LIMIT 10;
+
+-- 7.1 All actors with the first name "SCARLETT"
+SELECT * FROM actor
+WHERE first_name = 'SCARLETT';
+
+-- BONUS 7.2 Movies with ARMAGEDDON in the title, duration > 100 minutes
+SELECT title, length
+FROM film
+WHERE title LIKE '%ARMAGEDDON%' AND length > 100;
+
+-- BONUS 7.3 Number of films that include Behind the Scenes content
+SELECT COUNT(*) AS films_with_behind_the_scenes
+FROM film
+WHERE special_features LIKE '%Behind the Scenes%';