ผู้ใช้ที่ใช้งานรายเดือนใน StackOverflow / StackExchange ไม่จำเป็นต้องใช้ตารางทั้งหมด
Monthly active users in StackOverflow / StackExchange.It is not neccessary to use all the tables.
 Votes:  Id [ number]  PostId [ number]  VoteTypeId [ number]  UserId [ number]  CreationDate [ time]  BountyAmount [ number] 
SELECT COUNT(*) AS ActivePosters5 FROM Posts AS p WHERE p.Score >= 0 AND DATEDIFF(day, p.CreationDate, GETDATE()) <= 30 GROUP BY p.OwnerUserId HAVING COUNT(p.Id) >= 5