select category.name as 分类名称,
	   a.cnt as 电影数目
from category, (
	select category_id, count(film_id) as cnt from film_category 
	where film_id in (
			select film_id from film where description like "%robot%") and 
		category_id in (
			select distinct category_id from film_category where category_id in (
				select category_id from film_category 
				group by category_id having count(*) >= 5
	))
	group by category_id
) a
where category.category_id = a.category_id;