Week4 Lab2 done

sakila_basic_queries.sql

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+USE sakila
+-- 1) Display all available tables
+SHOW TABLES;
+
+-- 2) Retrieve all the data from actor, film, and customer
+SELECT * FROM actor;
+SELECT * FROM film;
+SELECT * FROM customer;
+
+-- 3) Retrieve specific columns
+-- 3.1 Titles of all films
+SELECT title FROM film;
+
+-- 3.2 List of languages (aliased as 'language')
+SELECT name AS language FROM language;
+
+-- 3.3 First names of all employees (staff)
+SELECT first_name FROM staff;
+
+-- 4) Retrieve unique release years
+SELECT DISTINCT release_year
+FROM film
+ORDER BY release_year;
+
+-- 5) Counting records
+-- 5.1 Number of stores
+SELECT COUNT(*) AS number_of_stores FROM store;
+
+-- 5.2 Number of employees
+SELECT COUNT(*) AS number_of_employees FROM staff;
+
+-- 5.3 How many films are available for rent and how many have been rented
+-- (A) Total copies available in inventory (all copies the company owns)
+SELECT COUNT(*) AS total_inventory_copies FROM inventory;
+
+-- (B) Total rentals ever made
+SELECT COUNT(*) AS total_rentals_made FROM rental;
+
+-- (Optional, nice-to-have) Current availability right now:
+-- Copies currently rented out (not yet returned)
+SELECT COUNT(*) AS copies_out_now
+FROM rental
+WHERE return_date IS NULL;
+
+-- Copies currently on the shelf (in inventory and NOT out now)
+SELECT COUNT(*) AS copies_available_now
+FROM inventory i
+LEFT JOIN rental r
+  ON r.inventory_id = i.inventory_id
+ AND r.return_date IS NULL
+WHERE r.rental_id IS NULL;
+
+-- 5.4 Number of distinct actor last names
+SELECT COUNT(DISTINCT last_name) AS distinct_actor_last_names
+FROM actor;
+
+-- 6) Retrieve the 10 longest films
+SELECT title, length
+FROM film
+ORDER BY length DESC, title ASC
+LIMIT 10;
+
+-- 7) Filtering
+-- 7.1 All actors with first name 'SCARLETT'
+SELECT *
+FROM actor
+WHERE first_name = 'SCARLETT';
+
+-- 7.2 Movies with 'ARMAGEDDON' in the title and duration > 100 minutes
+SELECT title, length
+FROM film
+WHERE title LIKE '%ARMAGEDDON%'
+  AND length > 100
+ORDER BY length DESC;
+
+-- 7.3 Number of films that include 'Behind the Scenes' content
+SELECT COUNT(*) AS films_with_behind_the_scenes
+FROM film
+WHERE special_features LIKE '%Behind the Scenes%';