题解 | #牛客直播转换率#
牛客直播转换率
http://www.nowcoder.com/practice/73bf143cfc7f452a8569c6d7eca380f9
SELECT
course_id, course_name,
ROUND(COUNT(DISTINCT IF(if_sign = 1, user_id, NULL)) / COUNT(DISTINCT IF(if_vw = 1, user_id, NULL)) * 100, 2) AS 'sign_rate(%)'
FROM
behavior_tb
JOIN course_tb
USING(course_id)
GROUP BY
course_id, course_name
