[lab-mysql-select] Lucia

my_code.sql

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+USE sakila;
+
+-- 1 Answers:121
+SELECT COUNT(DISTINCT(last_name))
+	FROM actor;
+
+-- 2 Answers:1
+SELECT COUNT(DISTINCT(language_id))
+	FROM film;
+
+-- 3 Answers: 223
+SELECT COUNT(rating)
+	FROM film
+	WHERE rating='PG-13';
+
+-- 4 
+SELECT title, length
+	FROM film
+    WHERE release_year=2006
+    ORDER BY length DESC
+    LIMIT 10;
+
+-- 5 Answers: 266
+-- RENTAL.rental_date last - first
+SELECT MAX(rental_date) as last_rental_date,
+	   MIN(rental_date) as first_rental_date,
+       DATEDIFF(MAX(rental_date), MIN(rental_date)) AS operating_days
+	FROM rental;
+
+-- 6
+SELECT *,
+       MONTH(rental_date) AS month,
+       WEEKDAY(rental_date) AS week_day
+	FROM rental
+    LIMIT 20;
+
+-- 7 
+ALTER TABLE rental
+ADD COLUMN day_type VARCHAR(12);
+
+SET SQL_SAFE_UPDATES = 0;
+UPDATE rental
+SET day_type = 'weekend' WHERE WEEKDAY(rental_date) in (5,6);
+UPDATE rental
+SET day_type = 'workday' WHERE WEEKDAY(rental_date) in (0,1,2,3,4);
+SET SQL_SAFE_UPDATES = 1;
+
+-- 8 Answers: 182
+SELECT COUNT(rental_id)
+	FROM rental
+    WHERE rental_date LIKE ('2006-02-%');
+
+-- 9 
+SELECT title,
+       rating
+	FROM film;
+
+SELECT DISTINCT(rating)
+	FROM film;
+
+-- 10
+SELECT title,
+       release_year
+	FROM film;
+
+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 LIKE ('%date%');   
+
+-- 15
+SELECT title
+	FROM film
+    ORDER BY LENGTH(title) DESC;
+
+-- 16
+SELECT title, length
+	FROM film
+    ORDER BY length DESC
+    LIMIT 10;
+
+-- 17 Answers: 538
+SELECT count(special_features) 
+	FROM film
+    WHERE special_features LIKE ('%Behind the Scenes%');
+
+-- 18
+SELECT * FROM film
+	ORDER BY release_year, title;
+
+-- 19
+ALTER TABLE staff
+DROP COLUMN picture;
+
+-- 20
+SELECT * FROM CUSTOMER
+	WHERE first_name = 'Tammy';
+SELECT * FROM staff
+	WHERE first_name = 'Jon';
+
+INSERT INTO staff(first_name, last_name, address_id, email, store_id, active, username)
+VALUES ('Tammy','Sanders',79,'tammy.sanders@sakilastaff.com',2,1,'tammy');
+
+SELECT * FROM staff
+	WHERE first_name = 'Tammy';
+
+
+-- 21
+SELECT * FROM film
+	WHERE title='Academy Dinosaur';
+
+SELECT * FROM inventory
+	ORDER BY inventory_id DESC;
+
+SELECT * FROM customer
+	WHERE first_name='Charlotte';
+
+SELECT * FROM staff
+	WHERE first_name='Mike';
+
+INSERT INTO inventory(film_id,store_id)
+VALUES(1,1);
+
+INSERT INTO rental(rental_date, inventory_id, customer_id, staff_id,day_type)
+VALUES('2023-10-25', 4582, 130, 1,'workday');
+
+SELECT * FROM rental
+	ORDER BY inventory_id DESC;
+
+
+-- 22
+SELECT * FROM customer
+	WHERE active=0;
+
+CREATE TABLE IF NOT EXISTS deleted_users (
+	customer_id SMALLINT PRIMARY KEY,
+    email VARCHAR(400),
+    date datetime
+);
+
+INSERT INTO deleted_users(customer_id,email)
+SELECT customer_id, email FROM customer
+WHERE customer.active=0;
+
+SELECT * FROM deleted_users;
+
+SET FOREIGN_KEY_CHECKS=0;
+SET SQL_SAFE_UPDATES = 0;        
+DELETE FROM customer WHERE customer.active=0;
+SET SQL_SAFE_UPDATES = 1;
+SET FOREIGN_KEY_CHECKS=1;
+
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