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(CASE
    WHEN DeletionDate IS NULL AND ClosedDate IS NULL THEN 1
    ELSE 0
  END) AS 'OpenQ',
  COUNT(*) AS AllQuestions,
  ROUND(CAST(COUNT(CASE
    WHEN DeletionDate IS NULL AND ClosedDate IS NULL THEN 1
    ELSE 0
    END) as float) / COUNT(*) * 100, 3) as Percentage 
  
FROM PostsWithDeleted
WHERE PostTypeId=1
GROUP BY DATEFROMPARTS(
    DATEPART(yyyy, CreationDate),
    DATEPART(mm, CreationDate),
    1)
ORDER BY Month

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