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 distinct round(avg(distinct score),3) as avg_score from recommend_tb as rb right join user_action_tb as ub on rb.rec_user=ub.user_id where rb.rec_info_l=ub.hobby_l;