Technology Trends (# Questions per Tag per Month)

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SELECT
  DATEADD(mm, (Year(Posts.CreationDate) - 1900) * 12 + Month(Posts.CreationDate) - 1, 0) AS Month,
  Tags.TagName,
  COUNT(*) AS Questions

FROM Tags
  LEFT JOIN PostTags ON PostTags.TagId = Tags.Id
  LEFT JOIN Posts ON Posts.Id = PostTags.PostId
  LEFT JOIN PostTypes ON PostTypes.Id = Posts.PostTypeId

WHERE
  Tags.TagName IN (
    -- Javascript MV* libraries and others
    'angularjs', 'backbone.js', 'dojo', 'ember.js', 'extjs', 'knockout.js', 'yui'
    
    -- Languages
    --'c', 'c++', 'c#', 'java', 'javascript', 'objective-c', 'perl', 'php', 'python', 'ruby', 'vb.net',
    --'go', 'haskell', 'lua', 'vb6'
    
    -- MV* Web Frameworks
    --'asp.net-mvc', 'django', 'ruby-on-rails',
    --'cakephp', 'codeigniter', 'express', 'laravel', 'meteor', 'sinatra', 'spring-mvc', 'symfony2', 'yii', 'zend-framework'
    
    -- SQL Databases
    --'mysql', 'oracle', 'postgresql', 'sql-server'
  ) AND
  
  PostTypes.Name = 'Question' AND
  
  -- Exclude the current month
  Posts.CreationDate < DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)

GROUP BY
  Year(Posts.CreationDate), Month(Posts.CreationDate), Tags.TagName

ORDER BY
  Year(Posts.CreationDate), Month(Posts.CreationDate), Tags.TagName

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