s.ไม่จำเป็นที่จะต้องใช้ทุกตาราง
s.It is not neccessary to use all the tables.
 PostLinks:  Id [ number]  CreationDate [ time]  PostId [ number]  RelatedPostId [ number]  LinkTypeId [ number] 
SELECT COUNT(*) FROM Posts WHERE PostTypeId = 1 AND AnswerCount > 0 AND NOT AcceptedAnswerId IS NULL