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SELECT
  DATEDIFF(d, Q.CreationDate, A.CreationDate) AS Days,
  AVG(1.0 * A.Score) AS AvgScore
FROM PostsWithDeleted Q, PostsWithDeleted A
WHERE
  A.ParentId = Q.Id
  AND
  A.CreationDate > Q.CreationDate
GROUP BY DATEDIFF(d, Q.CreationDate, A.CreationDate)
ORDER BY Days

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edited may 30 19

created may 30 19 peterh (2)