จำนวนคำตอบต่อวัน ไม่จำเป็นต้องใช้ทุกตาราง
number of answers per day.It is not neccessary to use all the tables.
 PostNoticeTypes:  Id [ number]  ClassId [ number]  Name [ text]  Body [ text]  IsHidden [ boolean]  Predefined [ boolean]  PostNoticeDurationId [ number] 
SELECT CAST(TIME_TO_STR(CreationDate, '%Y-%m-%d %H:%M:%S') AS TEXT(10)) AS date, COUNT(1) FROM Posts WHERE PostTypeId = 2 GROUP BY CAST(TIME_TO_STR(CreationDate, '%Y-%m-%d %H:%M:%S') AS TEXT(10)) ORDER BY date