s (ต่อวัน ระหว่างวันที่) ไม่จำเป็นต้องใช้ตารางทั้งหมด
s (per day, between dates).It is not neccessary to use all the tables.
 PostFeedback:  Id [ number]  PostId [ number]  IsAnonymous [ boolean]  VoteTypeId [ number]  CreationDate [ time] 
SELECT DATE(p.CreationDate), AVG(CAST(p.Score AS FLOAT)) FROM Posts AS p WHERE p.PostTypeId = 1 AND p.CreationDate >= '##Date1##' AND p.CreationDate <= '##Date2##' GROUP BY DATE(p.CreationDate) ORDER BY DATE(p.CreationDate)