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.score), 3) AS avg_score
FROM(
SELECT
DISTINCT u.user_id,
score
FROM user_action_tb u
JOIN recommend_tb r
ON u.user_id = r.rec_user
WHERE u.hobby_l = r.rec_info_l) t
