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select
COUNT(*) AS consecutiveDates,
  MIN(date) AS minDate,
  MAX(date) AS maxDate
from
(
SELECT DISTINCT 
      CAST(CreationDate AS DATE) date,
      dateadd(day, 
        -DENSE_RANK() OVER (ORDER BY CAST(CreationDate AS DATE)), 
        CAST(CreationDate AS DATE)) AS grp
    FROM Posts
    WHERE OwnerUserId = 5969627
) x
group by grp

fork query

edited oct 21 a1oleg

created nov 7 15 anonymous