lab solved v1

labs_SQL_Basic_Queries.sql

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+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;
+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 sakila.language;
+
+-- 3.3 List of first names of all employees from the staff table -- 
+select first_name from sakila.staff;
+
+-- 4 Retrieve unique release years.
+select distinct(release_year) from sakila.film;
+
+-- Counting records for database insights:
+-- 5.1 Determine the number of stores that the company has.
+select count(*) from sakila.store;
+
+-- 5.2 Determine the number of employees that the company has.
+select count(*) from sakila.staff;
+
+-- 5.3 Determine how many films are available for rent and how many have been rented.
+  SELECT 
+  (SELECT COUNT(DISTINCT inventory_id) 
+   FROM sakila.inventory 
+   WHERE inventory_id NOT IN (SELECT inventory_id FROM sakila.rental WHERE return_date IS NULL)) AS available_for_rent,
+
+  (SELECT COUNT(DISTINCT inventory_id) 
+   FROM sakila.rental 
+   WHERE return_date IS NULL) AS rented;
+
+-- 5.4 Determine the number of distinct last names of the actors in the database.
+select count(distinct last_name) 
+   from sakila.actor;  
+
+-- 6 Retrieve the 10 longest films.
+select film_id, title, length
+from sakila.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 sakila.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 * from sakila.film where upper(title) like "%ARMAGEDDON%"
+and length > 100;
+
+-- 7.3 Determine the number of films that include Behind the Scenes content
+select count(*) from sakila.film where special_features like "%BEHIND THE SCENES%";
+
+
+