project1_quetion3.sql

/*
  What are the top 10 film categories where most money have been received?
*/

SELECT DISTINCT category.category_id,
       category.name category,
       COUNT(category) OVER(PARTITION BY category) AS rental_count,
       ROUND(AVG(payment.amount) OVER(PARTITION BY category), 2) AS avg_amt_received,
       SUM(payment.amount) OVER(PARTITION BY category) AS total_amt_received
FROM film
JOIN film_category
ON film_category.film_id = film.film_id
JOIN category
ON film_category.category_id = category.category_id
JOIN inventory
ON film.film_id = inventory.film_id
JOIN rental
ON inventory.inventory_id = rental.inventory_id
JOIN payment
ON rental.rental_id = payment.rental_id
ORDER BY total_amt_received DESC
LIMIT 10;