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WITH Raw AS (
  SELECT
    Id,
    DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) AS Month,
    DATEDIFF(s, CreationDate, COALESCE(ApprovalDate, RejectionDate))
      AS TimeS
  FROM SuggestedEdits
  WHERE ApprovalDate IS NOT NULL OR RejectionDate IS NOT NULL
)
SELECT DISTINCT
  Month,
  1.0 *
    PERCENTILE_CONT(0.5)
      WITHIN GROUP (ORDER BY TimeS) OVER (PARTITION BY Month)
    / 3600
    AS MedianHours,
  1.0 * AVG(1.0 * TimeS) OVER (PARTITION BY Month) /3600 AS AverageHours
  --COUNT(*) OVER (PARTITION BY Month) AS Count
FROM Raw
ORDER BY Month DESC

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edited jan 21

created jan 21 peterh - PLEASE DELETE THIS ACCOUNT