题意条件:
- like匹配robot
- 每个电影分类下的总数目>=5(注意:并不是包含robot条件下的)
SELECT c.name AS `分类名称category.name`, COUNT(f.film_id) AS `电影数目count(film.film_id)` FROM film f, category c, film_category fc WHERE f.film_id = fc.film_id AND c.category_id = fc.category_id AND f.description LIKE '%robot%' AND c.category_id IN (SELECT category_id FROM film_category GROUP BY category_id HAVING COUNT(film_id) >= 5)