lab mysql select Marco

my-code.sql

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+-- 1 
+ select count(last_name) from actor;
+
+-- 2
+select count(language_id) from film;
+
+-- 3
+select count(rating = "PG-13")  from film;
+
+-- 4 
+select title, length, release_year = "2006"
+from film
+order by length desc
+limit 10;
+
+-- 5
+select DATEDIFF(max(rental_date), min(rental_date)) from rental;
+
+-- 6
+select
+    month(rental_date) AS mes,
+    WEEKDAY(rental_date) AS dia
+from rental
+limit 20 ;
+
+-- 7
+set SQL_SAFE_UPDATES = 0;
+update rental
+set day_type = if(WEEKDAY(rental_date) + 1 < 6, "workday", "weekend");
+
+
+
+-- 8
+select COUNT(*) AS rental_count
+from rental
+where year(rental_date) = year(NOW()) and month(rental_date) = month(NOW()) -1;
+
+-- 9
+select 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 like "%DATE%";
+
+-- 15
+select *
+from film
+order by length(title) desc
+limit 10;
+
+-- 16
+select *
+FROM film
+order by length desc
+limit 10;
+
+-- 17
+select COUNT(special_features)
+from film
+where special_features like '%Behind the Scenes%';
+
+-- 18
+select *
+from film
+order by release_year, title;
+
+-- 19
+
+-- could not find where the column picture is in the staff table.
+-- 20
+insert into staff (staff_id, first_name, last_name, address_id, email, store_id, active, username, password, last_update)
+values ('3', 'TAMMY', 'SANDERS', 2, 'TAMMY.SANDERS@sakilacustomer.org', 1, 1, 'tammy', 'password', '2006-02-15 04:57:20');
+select * from customer;
+select * from staff;
+-- 21  
+-- ???
+
+
+-- 22
+select COUNT(*) from customer where active = 0;
+-- 15 inactive users
+
+create table deleted_users AS
+select customer_id, email, create_date
+from customer
+where active = 0;
+
+delete from customer where active = 0;
+
+select * from deleted_users;