题解 | #使用子查询的方式找出属于Action分类的所有电影对应的title,description#

select title,description from film where film_id in(select f.film_id from film f left join film_category fc on f.film_id = fc.film_id left join category c on fc.category_id = c.category_id where c.name = "Action")

对子查询的理解并不是很透彻...