牛客网-SQL大厂面试题-1.各个视频的平均完播率
题目:各个视频的平均完播率
DROP TABLE IF EXISTS tb_user_video_log, tb_video_info; CREATE TABLE tb_user_video_log ( id INT PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID', uid INT NOT NULL COMMENT '用户ID', video_id INT NOT NULL COMMENT '视频ID', start_time datetime COMMENT '开始观看时间', end_time datetime COMMENT '结束观看时间', if_follow TINYINT COMMENT '是否关注', if_like TINYINT COMMENT '是否点赞', if_retweet TINYINT COMMENT '是否转发', comment_id INT COMMENT '评论ID' ) CHARACTER SET utf8 COLLATE utf8_bin; CREATE TABLE tb_video_info ( id INT PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID', video_id INT UNIQUE NOT NULL COMMENT '视频ID', author INT NOT NULL COMMENT '创作者ID', tag VARCHAR(16) NOT NULL COMMENT '类别标签', duration INT NOT NULL COMMENT '视频时长(秒数)', release_time datetime NOT NULL COMMENT '发布时间' )CHARACTER SET utf8 COLLATE utf8_bin; INSERT INTO tb_user_video_log(uid, video_id, start_time, end_time, if_follow, if_like, if_retweet, comment_id) VALUES (101, 2001, '2021-10-01 10:00:00', '2021-10-01 10:00:30', 0, 1, 1, null), (102, 2001, '2021-10-01 10:00:00', '2021-10-01 10:00:21', 0, 0, 1, null), (103, 2001, '2021-10-01 11:00:50', '2021-10-01 11:01:20', 0, 1, 0, 1732526), (102, 2002, '2021-10-01 11:00:00', '2021-10-01 11:00:30', 1, 0, 1, null), (103, 2002, '2021-10-01 10:59:05', '2021-10-01 11:00:05', 1, 0, 1, null); INSERT INTO tb_video_info(video_id, author, tag, duration, release_time) VALUES (2001, 901, '影视', 30, '2021-01-01 7:00:00'), (2002, 901, '美食', 60, '2021-01-01 7:00:00'), (2003, 902, '旅游', 90, '2020-01-01 7:00:00');
答案
select t1.video_id , round(count(if(t1.end_time-t1.start_time >= duration, 1, null)) / count(*),3) as avg_comp_play_rate from tb_user_video_log t1 join tb_video_info t2 on t1.video_id = t2.video_id where substring(t1.start_time, 1, 4) = '2021' group by t1.video_id order by avg_comp_play_rate desc
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