Em :) Finallyyyyyyy!!

sakila.sql

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+USE sakila;
+SET SQL_SAFE_UPDATES = 0;
+-- 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"; -- 223 movies
+
+--  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; -- 266
+
+-- 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
+
+ALTER TABLE staff
+DROP COLUMN picture;
+
+-- 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, "SANDERS@sakilacustomer.org", 2, 1,  "Tammy", null, "2006-02-15 04:57:2");
+
+-- 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
+select * from customer where active = 0;
+
+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;
+
+
+    -- Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column.  To disable safe mode, toggle the option in Preferences -> SQL Editor and reconnect.
+
+    -- Error Code: 1451. Cannot delete or update a parent row: a foreign key constraint fails (`sakila`.`payment`, CONSTRAINT `fk_payment_customer` FOREIGN KEY (`customer_id`) REFERENCES `customer` (`customer_id`) ON DELETE RESTRICT ON UPDATE CASCADE)
+
+