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

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edited nov 7 15 Lukas Eder

created nov 7 15 anonymous