คำถามและคำตอบต่อวันตั้งแต่บางวัน ไม่จำเป็นต้องใช้ทุกตาราง
Questions and Answers per Day since some date.It is not neccessary to use all the tables.
 ReviewTasks:  Id [ number]  ReviewTaskTypeId [ number]  CreationDate [ time]  DeletionDate [ time]  ReviewTaskStateId [ number]  PostId [ number]  SuggestedEditId [ number]  CompletedByReviewTaskId [ number] 
SELECT DATE(CreationDate), SUM(CASE WHEN PostTypeId = 1 THEN 1 ELSE 0 END) AS Questions, SUM(CASE WHEN PostTypeId = 2 THEN 1 ELSE 0 END) AS Answers FROM Posts WHERE CAST(TIME_TO_STR(CreationDate, '%Y-%m-%d %H:%M:%S') AS TEXT(10)) >= '##Date##' GROUP BY DATE(CreationDate) ORDER BY DATE(CreationDate) DESC