Solved lab

sakila-queries.sql

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+-- Selecting the database that is going to be used
+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. 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 from the staff table
+SELECT first_name
+FROM staff;
+
+-- 4. Retrieve unique release years.
+SELECT DISTINCT release_year
+FROM film;
+
+-- 5. Counting records for database insights:
+	-- 5.1 Determine the number of stores that the company has.
+SELECT COUNT(*) AS number_of_stores
+FROM store;
+
+	-- 5.2 Determine the number of employees that the company has.
+SELECT COUNT(*) AS number_of_employees
+FROM staff;
+
+	-- 5.3 Determine how many films are available for rent and how many have been rented.
+SELECT COUNT(DISTINCT film_id)
+FROM inventory;
+
+SELECT COUNT(DISTINCT inventory_id)
+FROM rental;
+
+	-- 5.4 Determine the number of distinct last names of the actors in the database.
+SELECT COUNT(DISTINCT last_name)
+FROM actor;
+
+-- 6. Retrieve the 10 longest films.
+SELECT *
+FROM film
+ORDER BY length DESC
+LIMIT 10;
+
+-- 7. Use filtering techniques in order to:
+	-- 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.
+	-- Hint: use LIKE operator. More information here.
+SELECT *
+FROM film
+WHERE length > 100 AND title LIKE '%armageddon%'
+
+	-- 7.3 Determine the number of films that include Behind the Scenes content
+SELECT *
+FROM film
+WHERE special_features LIKE '%behind the scenes%'