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WITH Raw AS (
  SELECT
    DATEADD(dd,
      7 * FLOOR(DATEDIFF(day, '1970-01-05', CreationDate) / 7),
      '1970-01-05') AS PostWeek,
    Id
  FROM Posts
)
SELECT
  PostWeek,
  COUNT(*) AS Count
FROM Raw
GROUP BY PostWeek
ORDER BY PostWeek;

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edited apr 4

created apr 4 peterh - PLEASE DELETE THIS ACCOUNT