Solved lab

lab-sql-basic-queries.sql

@@ -0,0 +1,84 @@
+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.
+-- 2.1. Retrieve all the data from the tables actor.
+SELECT * 
+FROM actor;
+
+-- 2.2. Retrieve all the data from the tables film.
+SELECT * 
+FROM film; 
+
+-- 2.3. Retrieve all the data from the tables customer.
+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(*)
+FROM store
+WHERE store_id IS NOT NULL;
+
+-- 5.2 Determine the number of employees that the company has.
+SELECT COUNT(*)
+FROM staff
+WHERE staff_id IS NOT NULL;
+
+-- 5.3 Determine how many films are available for rent and how many have been rented.
+-- 5.3.1 Determine how many films are available for rent
+SELECT COUNT(film_id) as amount_of_avaliable_films
+FROM inventory
+WHERE film_id IS NOT NULL;
+
+-- 5.3.2 Determine how many films have been rented
+SELECT COUNT(film_id) as amount_of_rented_films
+FROM inventory
+WHERE inventory_id IN (SELECT inventory_id from rental);
+
+-- 5.4 Determine the number of distinct last names of the actors in the database.
+SELECT COUNT(DISTINCT last_name) as last_name_count
+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 UPPER(first_name) = "SCARLETT";
+
+-- 7.2 Retrieve all movies that have ARMAGEDDON in their title and have a duration longer than 100 minutes.
+SELECT title
+FROM film
+WHERE title IS NOT NULL AND length > 100 AND  title LIKE '%ARMAGEDDON%';
+
+-- 7.3 Determine the number of films that include Behind the Scenes content
+SELECT COUNT(title) as 'count of titles with Behind the Scenes content'
+FROM film
+WHERE special_features LIKE '%Behind the Scenes%';