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Q&A for professional mathematicians

SELECT
  t.TagName,
  AVG(CAST(a.Score AS decimal))
FROM Posts q INNER JOIN Posts a ON a.ParentId=q.Id
  INNER JOIN PostTags pt ON q.Id = pt.PostId
  INNER JOIN Tags t ON pt.TagId = t.Id
WHERE t.Count>=##num?10##  
GROUP BY t.TagName
ORDER BY AVG(CAST(a.Score AS decimal)) DESC

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created jun 8 22 Martin20528