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with 
singleTagPostIds as 
  (select pt.postid as id
  from posts p
  join posttags pt on pt.postid = p.id
  where p.creationdate > '2020-11-30'
  group by pt.postid
  having count(pt.tagid) = 1),
mostPopularTags as
  (select top 100 t.tagname, count(pt.postid) as cnt
  from singleTagPostIds stp
  join posttags pt on pt.postid = stp.id
  join tags t on t.id = pt.tagid
  group by t.id, t.tagname
  order by count(pt.postid) desc)
select * from mostPopularTags
order by tagname

-- select top 10 count(tagid), postid from posttags group by postid having count(tagid) = 1

fork query

edited dec 10

created dec 10 jon.doe35042