Solved lab

lab_sql_basic_queries.sql

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+-- Select the correct db
+USE sakila;
+-- 1. Display all tables
+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 FROM language;
+-- 3.3 List of first names of all employees from the staff table
+SELECT first_name FROM staff;
+
+-- 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
+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
+-- (I use alias columns for better readability)
+SELECT
+    (SELECT COUNT(*) FROM inventory) AS films_available_for_rent,
+    (SELECT COUNT(DISTINCT inventory_id) FROM rental) AS films_rented;
+
+-- 5.4 Determine the number of distinct last names of the actors in the database.
+SELECT COUNT(DISTINCT last_name) AS distinct_last_names
+FROM actor;
+
+-- 6. Retrieve the 10 longest films
+SELECT title, length
+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';
+
+-- BONUS:
+-- 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(*) AS behind_the_scenes_count
+FROM film
+WHERE special_features LIKE '%Behind the Scenes%';