diff --git a/Sorting and Grouping/SELECT activity_date AS day,COUNT(DISTINCT user_id) AS active_users.sql b/Sorting and Grouping/SELECT activity_date AS day,COUNT(DISTINCT user_id) AS active_users.sql
new file mode 100644
index 0000000..b901239
--- /dev/null
+++ b/Sorting and Grouping/SELECT activity_date AS day,COUNT(DISTINCT user_id) AS active_users.sql	
@@ -0,0 +1,5 @@
+SELECT activity_date AS day,COUNT(DISTINCT user_id) AS active_users
+FROM activity
+WHERE activity_date BETWEEN DATE_SUB('2019-07-27',INTERVAL 29 DAY) AND '2019-07-27'
+GROUP BY activity_date
+ORDER BY activity_date;
\ No newline at end of file