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(t.avg_score),3) avg_score from (select rt.rec_user,avg(uat.score) avg_score from recommend_tb rt left join user_action_tb uat on rt.rec_user = uat.user_id group by rt.rec_user having sum(if(rt.rec_info_l=uat.hobby_l,1,0)) >= 1) t;
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