题解 | 推荐内容准确的用户平均评分
推荐内容准确的用户平均评分
https://www.nowcoder.com/practice/2dcac73b647247f0aef0b261ed76b47e
select round(avg(score),3) as avg_score from user_action_tb where user_id in (select distinct u.user_id from recommend_tb r left join user_action_tb u on r.rec_user=u.user_id where r.rec_info_l=u.hobby_l);
