select tag_combo from (select pttg.PostId ,STRING_AGG(ptt...

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select 
  tag_combo
from
  (select
  pttg.PostId
  ,STRING_AGG(pttg.TagId,',') WITHIN GROUP (ORDER BY pttg.TagId ASC) tag_combo
  from PostTags pttg
  group by pttg.PostId
  having count(pttg.tagid) > 1) t
group by tag_combo
order by count(1) desc

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