text: WITH rental_counts AS 
  (
  	SELECT 
    		f.film_id
    	FROM film f
    	JOIN inventory inv
    	ON f.film_id = inv.film_id
    	LEFT JOIN rental rent
    	ON inv.inventory_id = rent.inventory_id
    	WHERE DATE(rent.rental_ts) >= '2020-02-01'
    	AND DATE(rent.rental_ts) < '2020-03-01'
  )
  
  SELECT COUNT(film_id) as count
  FROM film
  WHERE film.film_id NOT IN 
  	(
  	  SELECT film_id
  	  FROM rental_counts
  	)