Questions and answers by a group of users over time

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Chess

Q&A for serious players and enthusiasts of chess

SELECT Q.Week, Q.Count AS Questions, A.Count AS Answers, P.Count AS puf
FROM (
  SELECT 
    DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0) AS [Week]
    , COUNT(*) AS Count
  FROM Posts
  INNER JOIN PostTags ON PostTags.PostId = Posts.Id
  INNER JOIN Tags ON PostTags.TagId = Tags.Id
  WHERE Tags.TagName = 'firebase' AND PostTypeId = 1 AND CreationDate > '2015-01-01'
  GROUP BY DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0)
) AS Q
LEFT JOIN (
  SELECT 
    DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0) AS [Week]
    , COUNT(*) AS Count
  FROM Posts
  WHERE CreationDate > '2015-01-01'
    AND 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
    0
  )
  GROUP BY DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0)
) AS A
ON Q.Week = A.Week
LEFT JOIN (
SELECT 
    DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0) AS [Week]
    , COUNT(*) AS Count
  FROM Posts
  WHERE CreationDate > '2015-01-01'
    AND OwnerUserId = 209103
  GROUP BY DATEADD(WEEK, DATEDIFF(WEEK, 0, CreationDate), 0)
) AS P
ON Q.Week = P.Week

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