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WITH
  weeks(week) AS (
    SELECT DISTINCT datepart(year, CreationDate) * 100 
                  + datepart(week, CreationDate)
    FROM Posts
    WHERE OwnerUserId = ##UserId##
  ),
  groups AS (
    SELECT
      ROW_NUMBER() OVER (ORDER BY week) AS rn,
      dateadd(day, -ROW_NUMBER() OVER (ORDER BY week), week) AS grp,
      week
    FROM weeks
  )
SELECT
  COUNT(*) AS consecutiveWeeks,
  MIN(week) AS minWeek,
  MAX(week) AS maxWeek
FROM groups
GROUP BY grp
ORDER BY 1 DESC, 2 DESC

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edited may 22 19

created nov 7 15 anonymous