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Network Engineering

Q&A for network engineers

select t.TagName, count(t.TagName) as numberOfQuestion
from Posts pos
join (select p.Id, count(p.Id) as tagsNum
  from PostTags pt
  join Posts p
    on pt.PostId = p.Id
  group by p.Id) tab
  on tab.Id = pos.id
join PostTags pt
  on pt.PostId = pos.Id
join Tags t
  on pt.TagId = t.Id
where tab.tagsNum = 1
group by t.TagName
order by numberOfQuestion desc

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