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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 (
    'java', 'c', 'c++', 'python', 'c#', 'r', 'php', 'javascript', 'ruby', 'matlab'
  ) 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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