题解 | 使用join查询方式找出没有分类的电影id以及名称

with tmp(fid,fn,c_id) as (
    select film.film_id, title, film_category.category_id
    from film left join film_category
    on film.film_id = film_category.film_id
)
select fid, fn
from tmp
where c_id is null