และคำตอบ ไม่จำเป็นต้องใช้ทุกตาราง
and its answers.It is not neccessary to use all the tables.
 PostHistory:  Id [ number]  PostHistoryTypeId [ number]  PostId [ number]  RevisionGUID [ other]  CreationDate [ time]  UserId [ number]  UserDisplayName [ text]  Comment [ text]  Text [ text]  ContentLicense [ text] 
SELECT Id, ParentId, PostTypeId, AnswerCount, AcceptedAnswerId, Title, Body, Tags, Score FROM Posts WHERE (Id IN (SELECT qs.Id FROM Posts AS qs WHERE (qs.Tags LIKE '%<machine-learning>%') AND qs.PostTypeId = 1)) OR (ParentId IN (SELECT qs.Id FROM Posts AS qs WHERE (qs.Tags LIKE '%<machine-learning>%') AND qs.PostTypeId = 1)) ORDER BY Id, ParentId