[Uri] lab-mysql-select

responses.sql

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+USE sakila;
+
+-- 1
+SELECT COUNT(DISTINCT last_name) AS distinct_last_names FROM actor; -- 121 distinct last names
+
+-- 2
+SELECT COUNT(DISTINCT language_id) AS distinct_languages FROM film; -- 1 language
+
+-- 3
+SELECT COUNT(*) AS pg13_movies FROM film 
+	WHERE rating = 'PG-13'; -- 223 movies wit PG-13 rating
+
+-- 4
+SELECT title, length FROM film
+	WHERE release_year = 2006
+	ORDER BY length DESC
+	LIMIT 10;
+
+-- 5
+SELECT DATEDIFF(NOW(), MIN(rental_date)) AS days_operating FROM rental; -- 6728 operating
+
+-- 6
+SELECT *, MONTH(rental_date) AS month, DAYOFWEEK(rental_date) AS weekday FROM rental
+LIMIT 20;
+
+-- 7
+SELECT *, 
+  CASE 
+    WHEN DAYOFWEEK(rental_date) IN (7, 8) THEN 'weekend'
+    ELSE 'workday'
+  END AS day_type
+FROM rental;
+
+-- 8
+SELECT COUNT(*) AS rentals_last_30_days FROM rental
+WHERE rental_date >= DATE_SUB((SELECT MAX(rental_date) FROM rental), INTERVAL 30 DAY); -- 182 rentlas in the last month of activity
+
+-- 9
+SELECT DISTINCT rating FROM film;
+
+-- 10
+SELECT DISTINCT release_year FROM film;
+
+-- 11
+SELECT * FROM film
+WHERE title LIKE "%ARMAGEDDON%";
+
+-- 12
+SELECT * FROM film
+WHERE title LIKE "%APOLLO%";
+
+-- 13
+SELECT * FROM film
+WHERE title LIKE "%APOLLO";
+
+-- 14
+SELECT * FROM film
+WHERE title REGEXP '\\bDATE\\b'; -- with regex because otherwise it would take words like CANDIDATE
+
+-- 15
+SELECT * FROM film
+ORDER BY LENGTH(title) DESC
+LIMIT 10;
+
+-- 16
+SELECT * FROM film
+ORDER BY length DESC
+LIMIT 10;
+
+-- 17
+SELECT COUNT(*) FROM film
+WHERE special_features LIKE "%Behind the Scenes%"; -- 538
+
+-- 18
+SELECT * FROM film
+ORDER BY release_year, title;
+
+-- 19
+ALTER TABLE staff
+DROP COLUMN picture;
+
+-- 20
+-- SELECT * FROM customer
+-- WHERE first_name LIKE 'TAMMY';
+
+INSERT INTO staff (staff_id, first_name, last_name, address_id, email, store_id, active, username, password)
+SELECT NULL, first_name, last_name, address_id, email, store_id, active, "tammy-username", NULL
+FROM customer
+WHERE first_name = "TAMMY" AND last_name = "SANDERS";
+
+-- 21
+-- get the customer_id for Charlotte Hunter
+SELECT customer_id
+INTO @customer_id
+FROM customer
+WHERE first_name = 'Charlotte' AND last_name = 'Hunter';
+
+-- get the film_id for "Academy Dinosaur" so it cab be used to check inventory_id
+SELECT film_id
+INTO @film_id
+FROM film
+WHERE title = 'Academy Dinosaur';
+
+-- get the inventory_id using film_id for "Academy Dinosaur"
+SELECT inventory_id
+INTO @inventory_id
+FROM inventory
+WHERE film_id = @film_id;
+
+-- get the staff_id for Mike Hillyer
+SELECT staff_id
+INTO @staff_id
+FROM staff
+WHERE first_name = 'Mike' AND last_name = 'Hillyer';
+
+-- insert the rental record
+INSERT INTO rental (rental_date, inventory_id, customer_id, staff_id, return_date)
+VALUES (NOW(), @inventory_id, @customer_id, @staff_id, NULL);
+
+-- 22
+-- Create the backup table
+CREATE TABLE IF NOT EXISTS deleted_users AS
+SELECT customer_id, email, NOW() AS deletion_date
+FROM customer
+WHERE active = 0;
+
+-- Delete the non-active users
+DELETE FROM customer
+WHERE active = 0;