LAB solved SQL

sakila.sql

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+USE sakila; 
+-- Display all available tables in the Sakila database.
+SHOW TABLES; 
+-- Retrieve all the data from the tables actor, film and customer.
+SELECT * 
+FROM actor; 
+SELECT * 
+FROM film;
+SELECT * 
+FROM customer;
+-- Titles of all films from the film table
+SELECT title 
+FROM film;
+-- List of languages used in films, with the column aliased as language from the language table
+SELECT name AS language 
+FROM language;
+-- 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;
+-- Determine the number of stores that the company has.
+SELECT COUNT(*)
+FROM store;
+-- Determine the number of employees that the company has.
+SELECT COUNT(*)
+FROM staff;
+-- Determine how many films are available for rent and how many have been rented.
+SELECT COUNT(*)
+FROM rental;
+SELECT COUNT(*) 
+FROM inventory i
+LEFT JOIN rental r ON i.inventory_id = r.inventory_id
+  AND r.return_date IS NULL
+WHERE r.inventory_id IS NULL;
+-- Determine the number of distinct last names of the actors in the database.
+SELECT COUNT(DISTINCT last_name)
+FROM actor;
+-- Retrieve the 10 longest films.
+ SELECT length
+ FROM film
+ ORDER BY length DESC
+ LIMIT 10;
+ -- Retrieve all actors with the first name "SCARLETT".
+ SELECT *
+ FROM actor
+ WHERE first_name = "SCARLETT";