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Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles

DECLARE @refdate DATETIME = DATEFROMPARTS(2011,10,1);
SELECT
  DATEADD(week, MIN(C.WeekNumber), @refdate) AS WeekNumber,
  COUNT(*) AS UserCount
FROM (
SELECT
  DATEDIFF(week, @refdate, P.CreationDate) AS WeekNumber
  --MAX(P.OwnerUserId) AS UserId
FROM Posts P
WHERE P.CreationDate >= @refdate
GROUP BY
  P.OwnerUserId,
  DATEDIFF(week, @refdate, P.CreationDate)
HAVING COUNT(*) >= 3
) C
GROUP BY WeekNumber
ORDER BY WeekNumber

fork query

created jun 8 starball