没有把子查询加在from里的吗？

select f.title, f.description
from (
select c.category_id , f.film_id
from film_category fc , category c , film f
WHERE f.film_id =fc.film_id
AND fc.category_id = c.category_id
AND c.name = 'Action'
) a , film f
WHERE f.film_id = a.film_id
;