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SELECT
  u.Id AS [User Link],
  Count(*) AS [Answer count],
  Min(Len(p.Body)) AS [Min],
  Avg(Len(p.Body)) AS [Average],
  Max(Len(p.Body)) AS [Max],
  Var(Len(p.Body)) AS [Variance],
  Stdev(Len(p.Body)) AS [StDev]
FROM Users u, Posts p
WHERE p.OwnerUserId = u.Id
  AND p.PostTypeId = 2
  AND (SELECT Count(q.Id)
       FROM Posts q
       WHERE q.OwnerUserId = u.Id AND p.PostTypeId = 2
       GROUP BY q.OwnerUserId) >= 10
GROUP BY u.Id
ORDER BY [Average]

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edited jan 12 14

created jan 12 14 Gilles