.ไม่จำเป็นต้องใช้ทุกตาราง
.It is not neccessary to use all the tables.
 Votes:  Id [ number]  PostId [ number]  VoteTypeId [ number]  UserId [ number]  CreationDate [ time]  BountyAmount [ number] 
SELECT p1.OwnerUserId, p2.OwnerUserId FROM Posts AS p1 JOIN Posts AS p2 ON p1.ParentId = p2.ParentId WHERE p1.OwnerUserId < p2.OwnerUserId AND p1.PostTypeId = 2 AND p2.PostTypeId = 2