ต่อแท็ก ไม่จำเป็นต้องใช้ทุกตาราง
s per tag.It is not neccessary to use all the tables.
 PendingFlags:  Id [ number]  FlagTypeId [ number]  PostId [ number]  CreationDate [ time]  CloseReasonTypeId [ number]  CloseAsOffTopicReasonTypeId [ number]  DuplicateOfQuestionId [ number]  BelongsOnBaseHostAddress [ text] 
SELECT t.TagName, t.Count AS "# of questions", ROUND(100.0 * (t.Count - COUNT(*)) / t.Count, 2) AS "% downvoted" FROM Tags AS t INNER JOIN PostTags AS pt ON t.Id = pt.TagId LEFT OUTER JOIN Votes AS v ON v.PostId = pt.PostId AND v.VoteTypeId = 3 WHERE v.PostId IS NULL GROUP BY t.TagName, t.Count ORDER BY ROUND(100.0 * (t.Count - COUNT(*)) / t.Count, 2) DESC