diff --git a/1141-user-activity-for-the-past-30-days-i.sql b/1141-user-activity-for-the-past-30-days-i.sql
index 8b46b0d..3174584 100644
--- a/1141-user-activity-for-the-past-30-days-i.sql
+++ b/1141-user-activity-for-the-past-30-days-i.sql
@@ -1,5 +1,13 @@
 # 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;
+SELECT 
+    activity_date AS day, 
+    COUNT(DISTINCT user_id) AS active_users
+FROM 
+    Activity
+WHERE 
+    DATEDIFF('2019-07-27', activity_date) < 30 
+    AND activity_date <= '2019-07-27'
+GROUP BY 
+    activity_date
+ORDER BY 
+    day;