จำนวนผู้ใช้ที่โพสต์ครั้งล่าสุดในเดือนที่กำหนด ไม่จำเป็นต้องใช้ตารางทั้งหมด
Number of users which made their last post in a given month.It is not neccessary to use all the tables.
 ReviewRejectionReasons:  Id [ number]  Name [ text]  Description [ text]  PostTypeId [ number] 
WITH last_cte AS (SELECT OwnerUserId, MAX(Id) AS MaxId FROM Posts GROUP BY OwnerUserId), dates_cte AS (SELECT p.OwnerUserId AS odn, p.Id AS pid, p.CreationDate AS CDate FROM Posts AS p INNER JOIN last_cte ON p.Id = maxid) SELECT LAST_DATE_OF_MONTH(CDate), COUNT(odn) FROM dates_cte GROUP BY LAST_DATE_OF_MONTH(CDate) ORDER BY LAST_DATE_OF_MONTH(CDate)