Create 1141-user-activity-for-the-past-30-days-i.sql

Author: everthis

1141-user-activity-for-the-past-30-days-i.sql

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+# Write your MySQL query statement below
+select activity_date as day, count(distinct user_id) as active_users 
+from Activity
+where datediff('2019-07-27', activity_date) < 30
+group by activity_date;