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#
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
http://www.nowcoder.com/practice/2f2e556d335d469f96b91b212c4c203e
首先，查询出Action的类别id
select category_id from category where name = 'Action';-- 返回1
第二，拿着Action的类别id，去查询属于该类别的电影id
select film_id from film_category where category_id = (select category_id from category where name = 'Action');
第三，去film表中查询
select title,description from film
where film_id in (
select film_id from film_category
where category_id = (
select category_id from category where name = 'Action'
)
)
;
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