คุณได้ลองอะไรไปแล้ว ' ความคิดเห็น ไม่จำเป็นต้องใช้ตารางทั้งหมด
What have you tried' Comments.It is not neccessary to use all the tables.
 PostNotices:  Id [ number]  PostId [ number]  PostNoticeTypeId [ number]  CreationDate [ time]  DeletionDate [ time]  ExpiryDate [ time]  Body [ text]  OwnerUserId [ number]  DeletionUserId [ number] 
SELECT C.PostId AS "post_link", C.Id AS "comment_link", C.CreationDate, C.UserId AS "user_link" FROM Comments AS C WHERE REPLACE(UPPER(C.Text), ' ', '') = 'WHATHAVEYOUTRIED?' ORDER BY C.CreationDate DESC