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SELECT DISTINCT(DATEDIFF(YEAR, CreationDate, GETDATE())) AS 'Age in years',
  PERCENTILE_CONT(0.25) WITHIN GROUP (ORDER BY ViewCount)
    OVER (PARTITION BY DATEDIFF(YEAR, CreationDate, GETDATE())) AS '25%',
  PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY ViewCount)
    OVER (PARTITION BY DATEDIFF(YEAR, CreationDate, GETDATE())) AS '50%',
  PERCENTILE_CONT(0.75) WITHIN GROUP (ORDER BY ViewCount)
    OVER (PARTITION BY DATEDIFF(YEAR, CreationDate, GETDATE())) AS '75%',
  ROUND(STDEV(ViewCount)
    OVER (PARTITION BY DATEDIFF(YEAR, CreationDate, GETDATE())), 2) AS 'StDev'
  FROM Posts
  WHERE PostTypeId = 1 -- Questions
  ORDER BY 1 DESC

fork query

edited nov 27

created nov 27 Glorfindel