题解 | #牛客直播转换率#
牛客直播转换率
https://www.nowcoder.com/practice/73bf143cfc7f452a8569c6d7eca380f9
select b.course_id ,course_name ,round(100*sum(if_sign)/sum(if_vw),2) as 'sign_rate(%)' from behavior_tb b left join course_tb a on a.course_id = b.course_id group by b.course_id,course_name order by course_id