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SELECT Q.YEAR, Q.Count AS "##Tag## Questions", A.Count AS "Googler Answers"
FROM (
  SELECT 
    DATEADD(YEAR, DATEDIFF(YEAR, 0, CreationDate), 0) AS [YEAR]
    , COUNT(*) AS Count
  FROM Posts
  INNER JOIN PostTags ON PostTags.PostId = Posts.Id
  INNER JOIN Tags ON PostTags.TagId = Tags.Id
  WHERE Tags.TagName = '##Tag##' AND PostTypeId = 1 AND CreationDate > '2012-01-01'
  GROUP BY DATEADD(YEAR, DATEDIFF(YEAR, 0, CreationDate), 0)
) AS Q
LEFT JOIN (
  SELECT 
    DATEADD(YEAR, DATEDIFF(YEAR, 0, A.CreationDate), 0) AS [YEAR]
    , COUNT(*) AS Count
  FROM Posts AS A
  INNER JOIN Posts AS Q ON A.ParentId = Q.Id
  INNER JOIN PostTags ON PostTags.PostId = Q.Id
  INNER JOIN Tags ON PostTags.TagId = Tags.Id
  WHERE Tags.TagName = '##Tag##'
    AND A.CreationDate > '2012-01-01'
    AND A.OwnerUserId in (
    209103, -- puf
    394010, -- katowulf
    110915, -- mikelehen
    879295, -- rdimarco
    1373162, -- deast
    5385206, -- sganem
    3875023, -- mpmcdonald
    5081766, -- bojeil
    807126, -- dougstevenson
    1410370, -- arthurthompson
    839465, -- mimming
    324977, -- samstern
    819314, -- ianbarber
    1172232, -- gregsoltis
    937583, -- raynor
    613115, -- dgiorgino
    1915327, -- dmabin
    4186942, -- bjiang
    4625829, -- aalawi
    4447017, -- andysoto
    0
  )
  GROUP BY DATEADD(YEAR, DATEDIFF(YEAR, 0, A.CreationDate), 0)
) AS A
ON Q.YEAR = A.YEAR

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edited dec 16 16

created jul 12 16 Frank van Puffelen