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WITH 
groups(dates,grp) AS (

  SELECT DISTINCT CAST(CreationDate AS DATE),
  dateadd(day, -ROW_NUMBER() OVER (ORDER BY CAST(CreationDate AS DATE)), CAST(CreationDate AS DATE))
   FROM Posts
   WHERE OwnerUserId = ##UserId##
  )
SELECT 
  COUNT(*) AS consecutiveDates,
  MIN(dates) AS minDate,
  MAX(dates) AS maxDate
FROM groups
GROUP BY grp
ORDER BY 1 DESC, 2 DESC

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edited feb 25

created nov 7 15 anonymous