Solved lab

LAB_SQL_Basic_Queries.sql

@@ -0,0 +1,56 @@
+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, film, 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_stores
+FROM store;
+
+--     5.2 Determine the number of employees that the company has.
+SELECT COUNT(*) AS number_employees
+FROM staff;
+
+--     5.3 Determine how many films are available for rent and how many have been rented.
+SELECT inventory_id
+FROM inventory; rental, film ?
+
+--     5.4 Determine the number of distinct last names of the actors in the database.
+SELECT COUNT(DISTINCT last_name) AS number_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 actor_id, first_name, last_name
+FROM actor
+WHERE first_name = "SCARLETT";
+