From 7b2606a7a4cea3b0354489fd3e4320efa7688981 Mon Sep 17 00:00:00 2001
From: Sara <saraab275@gmail.com>
Date: Wed, 25 Oct 2023 18:38:01 +0200
Subject: [PATCH] lab-mysql-select

---
 Ironhack lectures.sql | 122 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 Ironhack lectures.sql

diff --git a/Ironhack lectures.sql b/Ironhack lectures.sql
new file mode 100644
index 0000000..0d8bc19
--- /dev/null
+++ b/Ironhack lectures.sql	
@@ -0,0 +1,122 @@
+SET SQL_SAFE_UPDATES = 0;
+USE sakila;
+-- 1 How many distinct (different) actors’ last names are there?
+select count(distinct(last_name))
+	from actor;  -- 121 unique
+-- 2 In how many different languages where the films originally produced? (Use the column language_id from the film table)
+select count(distinct(language_id))
+	from film;  -- 1 unique
+-- 3 How many movies were released with “PG-13” rating?
+select rating
+	from film
+    where film.rating = "pg-13";
+
+--  4 Get 10 the longest movies from 2006.
+select length, title
+	from film
+    where film.release_year > "2005"
+    order by length desc
+    limit 10;
+
+-- 5 How many days has been the company operating (check DATEDIFF() function)?
+select rental_date
+	from rental
+    order by rental_date desc; -- 2006-02-14 15:16:03
+select rental_date
+	from rental
+    order by rental_date asc;  --  2005-05-24 22:53:30
+select datediff(max(rental_date), min(rental_date)) as days
+	from rental;
+    
+-- 6. Show rental info with additional columns month and weekday. Get 20.
+SELECT *, MONTH(rental_date) as Month,  Dayofweek(rental_date) as Day
+	from rental;
+    
+-- 7. Add an additional column day_type with values ‘weekend’ and ‘workday’ depending on the rental day of the week.
+SELECT *, IF(weekday(rental_date) +1 < 6,“workday”,“weekend”) as day_type
+from rental;
+
+-- 8. How many rentals were in the last month of activity?
+SELECT * from rental;
+SELECT COUNT(rental_date)
+FROM rental 
+WHERE rental_date LIKE ("2005-08%");
+
+-- 9. Get film ratings.
+SELECT rating
+FROM film;
+
+-- 10. Get release years.
+SELECT release_year
+FROM film;
+
+-- 11. Get all films with ARMAGEDDON in the title.
+SELECT title
+FROM film 
+WHERE film.title LIKE ("%ARMAGEDDON%");
+
+-- 12. Get all films with APOLLO in the title
+SELECT title
+FROM film 
+WHERE film.title LIKE ("%APOLLO%");
+
+-- 13. Get all films which title ends with APOLLO.
+SELECT title
+FROM film 
+WHERE film.title LIKE ("%APOLLO");
+
+-- 14. Get all films with word DATE in the title.
+SELECT title
+FROM film 
+WHERE film.title LIKE ("% DATE%") OR film.title LIKE ("%DATE %");
+
+-- 15. Get 10 films with the longest title.
+SELECT title
+FROM film
+ORDER BY LENGTH(title) DESC
+LIMIT 10;
+
+-- 16. Get 10 the longest films.
+SELECT length, title
+	FROM film
+    ORDER BY length DESC
+    LIMIT 10;
+    
+-- 17. How many films include Behind the Scenes content?
+SELECT special_features
+	FROM film 
+	WHERE film.special_features = "Behind the Scenes";
+    
+-- 18. List films ordered by release year and title in alphabetical order.
+SELECT title
+FROM film 
+ORDER BY film.title ASC, film.release_year;
+
+-- 19. Drop column picture from staff.
+ALTER TABLE staff 
+DROP COLUMN picture;
+SELECT * from staff;
+
+-- 20. A new person is hired to help Jon. Her name is TAMMY SANDERS, and she is a customer. Update the database accordingly.
+SELECT * FROM customer
+WHERE first_name = "Tammy" AND last_name="Sanders";
+INSERT INTO staff (staff_id, first_name, last_name, address_id, email, store_id, active, username, password, last_update)
+VALUES (3, "tammy", "sanders", 79, "TAMMY.SANDERS@sakilacustomer.org", 2, 1,  "Tammy", null, "2006-02-15 04:57:20");
+
+-- 21. Add rental for movie "Academy Dinosaur" by Charlotte Hunter from Mike Hillyer at Store 1. You can use current date for the rental_date column in the rental table. Hint: Check the columns in the table rental and see what information you would need to add there. You can query those pieces of information. For eg., you would notice that you need customer_id information as well. To get that you can use the following query:
+INSERT INTO rental (rental_date, customer_id, staff_id, inventory_id)
+VALUES (
+	curdate(),
+    (SELECT customer_id FROM customer WHERE first_name = 'CHARLOTTE' AND last_name = 'HUNTER'),
+    (SELECT staff_id FROM staff WHERE first_name = 'Mike' AND last_name = 'Hillyer'),
+    (SELECT max(inventory_id) FROM inventory WHERE film_id = (SELECT max(film_id) FROM film WHERE title = 'Academy Dinosaur') AND store_id = 1)
+);
+
+-- 22. Delete non-active users, but first, create a backup table deleted_users to store customer_id, email, and the date for the users that would be deleted. Follow these steps:
+-- Check if there are any non-active users
+-- Create a table backup table as suggested
+-- Insert the non active users in the table backup table
+-- Delete the non active users from the table customer
+SET FOREIGN_KEY_CHECKS=0;
+CREATE TABLE deleted_users AS SELECT customer_id, email, current_date() FROM customer WHERE active = 0;
+DELETE FROM customer WHERE active = 0;