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Drones and Model Aircraft Meta

Q&A for experienced flyers, pilots, and builders of drones and model aircraft

select tag.tagname,count(pt.postId)
from (
select p.Id as postId, count(distinct pt.TagId) as tagsNum
from PostTags pt
inner join Posts p on p.Id=pt.postId
group by p.Id
having count(distinct pt.TagId)=1
) t
join PostTags pt on (t.postId=pt.postId)
join Tags tag  on (tag.id=pt.tagId)
group by tag.tagname
order by 2 desc

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