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+use sakila;
+-- 1. how many distinct actors last name are there?
+select count(actor_id) from actor;
+
+-- 2. how many different language where films orginally produced
+select count(language_id) from language;
+
+-- 3 how many movies were released with pg-13
+
+select count(*) as movies_pG13 from film where rating = "PG-13";
+-- 4 get the longest movies from 2006
+SELECT title, length FROM film WHERE release_year = 2006 ORDER BY length DESC LIMIT 10;
+
+-- 5 how many days has the company been operating?
+-- option 1 ( my thought)
+
+select count(distinct rental_date) as days_operating from rental; 
+-- result i got around 15815 days 
+
+-- option 2 ( what i discover from other source, but since we have not study curdate(), i am hesitant to use it,
+
+SELECT DATEDIFF(CURDATE(), MIN(rental_date)) AS operating_days FROM rental;
+
+-- answer i got 6948 days
+
+-- Add an additional column day_type with values 'weekend' and 'workday' depending on the rental day of the week.
+
+SELECT 
+    rental_id, 
+    rental_date, 
+    DATE_FORMAT(rental_date, '%M') AS month, 
+    DATE_FORMAT(rental_date, '%W') AS weekday,
+    IF(WEEKDAY(rental_date) IN (5, 6), 'weekend', 'workday') AS day_type
+FROM 
+    rental 
+LIMIT 20;
+
+-- 8 How many rentals were in the last month of activity?
+
+SELECT COUNT(*) AS rentals_last_month 
+FROM rental 
+WHERE rental_date >= (SELECT MAX(rental_date) - INTERVAL 1 MONTH FROM rental);
+