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Q&A for people studying math at any level and professionals in related fields

SELECT
  DATEADD(hour, DATEDIFF(hour, 0, CreationDate), 0) AS Hour,
  COUNT(*) AS NumberOfPosts
FROM
  Posts
WHERE
  CreationDate > DATEADD(week, -70, GETDATE()) -- This filters out posts older than 4 weeks
GROUP BY
  DATEADD(hour, DATEDIFF(hour, 0, CreationDate), 0)
ORDER BY
  Hour;

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edited aug 12 anonymous

created apr 3 Johannes.Wachs