Solved lab

sakila_basic_queries.sql

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+-- Use the sakila database to do the following tasks:
+USE sakila;
+
+-- 1. Display all available tables in the Sakila database.
+SHOW FULL 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(*) FROM store;
+
+-- 5.2 Determine the number of employees that the company has.
+SELECT COUNT(*) FROM staff;
+
+-- 5.3 Determine how many films are available for rent and how many have been rented.
+SELECT COUNT(*) FROM film;
+
+-- 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 title 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 first_name, last_name FROM actor
+WHERE first_name LIKE '%SCAR%';
+
+-- BONUS:
+-- 7.2 Retrieve all movies that have ARMAGEDDON in their title and have a duration longer than 100 minutes.
+-- Hint: use LIKE operator.
+SELECT title FROM film
+WHERE title REGEXP 'ARMAGEDDON';
+
+-- 7.3 Determine the number of films that include Behind the Scenes content
+SELECT special_features, COUNT(*)
+FROM film
+GROUP BY special_features;
+
+SELECT COUNT(*) AS films_with_special_features
+FROM film
+WHERE special_features IS NOT NULL
+  AND special_features <> '';