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(distinct score),3) avg_acore from recommend_tb r join user_action_tb u on r.rec_user = u.user_id and rec_info_l = hobby_l # 注意要加上distinct
