select f.title, f.rating from film f
inner join inventory i on f.film_id=i.film_id
inner join rental r on i.inventory_id=r.inventory_id
inner join customer c on r.customer_id=c.customer_id
where c.first_name='KATIE' and c.last_name='ELLIOTT'
order by CASE WHEN f.rating='R' THEN 0 ELSE 1 END, f.title asc;
;
show status like 'Last_query_cost';