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SELECT COUNT(*)
FROM Posts p
WHERE 
    p.PostTypeId = 1 -- questions only
    AND EXISTS (
      SELECT * FROM PostHistory ph
          INNER JOIN PostHistory ph2 ON ph2.postId = ph.postId
          AND ph2.PostHistoryTypeId IN (5) -- edit title(4), body(5), tags(6)
            AND ph2.CreationDate > ph.CreationDate
            AND ph2.UserId = p.OwnerUserId
      WHERE ph.postId = p.Id
        AND ph.PostHistoryTypeId = 10 -- closed
        )
    AND EXISTS (
      SELECT * FROM PostHistory ph
      WHERE ph.postId = p.Id
        AND ph.PostHistoryTypeId = 11 -- reopened
        )

fork query

edited nov 15 15

created nov 15 15 jason.goemaat