จำนวนผู้ใช้งานในเดือนที่แล้ว ไม่จำเป็นต้องใช้ตารางทั้งหมด
Number of active users last month.It is not neccessary to use all the tables.
 PendingFlags:  Id [ number]  FlagTypeId [ number]  PostId [ number]  CreationDate [ time]  CloseReasonTypeId [ number]  CloseAsOffTopicReasonTypeId [ number]  DuplicateOfQuestionId [ number]  BelongsOnBaseHostAddress [ text] 
SELECT COUNT(*) AS ActiveUsersLastMonth FROM Users WHERE LastAccessDate >= DATEADD(month, -1, (SELECT MAX(LastAccessDate) FROM Users))