题解 | #各个视频的平均完播率#
各个视频的平均完播率
https://www.nowcoder.com/practice/96263162f69a48df9d84a93c71045753
SELECT
a.video_id,
avg( CASE WHEN timestampdiff( SECOND, start_time, end_time ) >= b.duration THEN 1 ELSE 0 END ) counts
FROM
tb_user_video_log a
JOIN tb_video_info b ON a.video_id = b.video_id
GROUP BY
a.video_id
）。
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