Number of open, closed and deleted questions by month

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SELECT
  DATEFROMPARTS(
    DATEPART(yyyy, CreationDate),
    DATEPART(mm, CreationDate),
    1) AS Month,
  COUNT(DeletionDate) AS Deleted,
  COUNT(CASE
    WHEN DeletionDate IS NOT NULL OR ClosedDate IS NOT NULL THEN 1
    ELSE NULL
  END) AS ClosedOrDeleted,
  COUNT(*) AS AllQuestions,
  COUNT(CASE
    WHEN DeletionDate IS NULL AND ClosedDate IS NULL THEN 1
    ELSE NULL
  END) AS [Open]
FROM PostsWithDeleted
WHERE PostTypeId=1
GROUP BY DATEFROMPARTS(
    DATEPART(yyyy, CreationDate),
    DATEPART(mm, CreationDate),
    1)
ORDER BY Month

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