เดือนละกี่คำตอบ?ไม่จำเป็นต้องใช้ทุกตาราง
How many answers per month?.It is not neccessary to use all the tables.
 Tags:  Id [ number]  TagName [ text]  Count [ number]  ExcerptPostId [ number]  WikiPostId [ number] 
SELECT u.DisplayName, MONTH(p.CreationDate) + YEAR(p.CreationDate) * 100 AS "mdate", COUNT(u.DisplayName) AS "num" FROM Posts AS p, Users AS u WHERE p.PostTypeId = 2 AND p.OwnerUserId IN ('##uid##') AND p.OwnerUserId = u.Id GROUP BY MONTH(p.CreationDate) + YEAR(p.CreationDate) * 100, u.DisplayName ORDER BY Num DESC