先写film_id 的阈值
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/questionTerminal/2f2e556d335d469f96b91b212c4c203e
SELECT title, description
FROM film f
WHERE film_id IN
(
SELECT film_id
FROM film_category fc
LEFT JOIN category c ON fc.category_id = c.category_id
WHERE c.name = 'Action'
)
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