instruction: Edit Impact on Questions only. including rollbacks, retags & title-changes
  This query also runs for the userid you provide ;)
response: WITH Editors AS (SELECT DISTINCT PostId, UserId, 1 AS ECount FROM PostHistory WHERE PostHistoryTypeId > 3 AND PostHistoryTypeId < 10), QuestionCount AS (SELECT COUNT(*) AS TotalQuestions FROM Posts WHERE PostTypeId = 1 AND ClosedDate IS NULL) SELECT ROW_NUMBER() OVER (ORDER BY SUM(ECount) DESC) AS "rank", Users.Id AS "userlink", Users.DisplayName AS "sortname", TotalQuestions, SUM(Editors.ECount) AS EditedQuestions, ROUND(100.0 * SUM(Editors.ECount) / TotalQuestions, 2) AS "percent" FROM Users, QuestionCount, Editors WHERE Users.Id = @userid AND Editors.UserId = @userid GROUP BY Users.Id, Users.DisplayName, TotalQuestions