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(a.score),3) from ( select distinct rt.rec_user, ut.score from recommend_tb rt join user_action_tb ut on rt.rec_user = ut.user_id and rt.rec_info_l = ut.hobby_l ) a
