ผู้ใช้อันดับต้นๆ ในจำนวนคำตอบใน R.ไม่จำเป็นต้องใช้ตารางทั้งหมด
Top users in number of answers in R.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 COUNT(t2.Score) AS number_of_answers, t2.OwnerUserId FROM Posts AS t1 INNER JOIN Posts AS t2 ON t1.Id = t2.ParentId WHERE t1.Tags LIKE '%<homework>%' GROUP BY t2.OwnerUserId ORDER BY number_of_answers DESC