题解 | 请写出计算粉丝ctr的sql语句
请写出计算粉丝ctr的sql语句
https://www.nowcoder.com/practice/853a6567cf524f63bab0879b8d0bfe62
select round(sum(c.read_num)/sum(c.show_num),4) as fans_ctr from a join b on a.author_id=b.author_id join c on a.fans_id=c.fans_id and b.content_id=c.content_id
show_num 曝光次数
read_num 阅读次数
