桌子 film
film_id title description rental_rate
桌子 category
category_id name last_update
桌子 film_category
film_id category_id last_update
我有SQL选择租金率最喜欢的5个
SELECT title, rental_rate FROM film ORDER BY rental_rate DESC LIMIT 5
基于上面的SQL，如何选择4个最喜欢的类别？
我想要的结果就是 category.name
尝试这个：
select * from (select t3.name,sum(t1.rental_rate) as rate from film as t1
inner join film_category as t2 on t1.film_id=t2.film_id
inner join category as t3 on t2.category_id=t3.category_id
group by t2.category_id) as detail order by rate DESC LIMIT 5
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