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  y int,
  numPosts int

INSERT INTO @AnnualPosts (y, numPosts)

  select year(CreationDate), count(id)
  from Posts
  where answerCount + CommentCount > 0
  group by year(CreationDate)

  tagId int,
  tagName varChar(32),
  usage int, 
  y int

-- INSERT INTO @TopTags (tagID, tagName, usage, y)

select top 100 t.id tagId, t.tagName, count(p.id) postCount, 
sum (case when year(p.creationDate) = 2015 then 1 else 0 end) usage2015, 
sum (case when year(p.creationDate) = 2016 then 1 else 0 end) usage2016 
from tags t
join PostTags pTags on pTags.tagId = t.id
join Posts p on pTags.postId = p.id
where year(p.creationDate) in (2015, 2016)
group by t.Id, t.tagName
order by count(p.id) desc 

-- select * from @TopTags

Enter Parameters

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