1142-user-activity-for-the-past-30-days-ii.sql

# Write your MySQL query statement below
SELECT ifnull(ROUND(COUNT(DISTINCT session_id)/COUNT(DISTINCT user_id), 2),0.00) 
AS average_sessions_per_user
FROM Activity 
WHERE activity_date >= '2019-06-28' and activity_date <= '2019-07-27';