instruction: How many users have I helped?. A count of the unique users who have accepted one of a user's answers.
  (Excludes the user accepting their own answers)
response: SELECT COUNT(a.Id) AS "total_answers", COUNT(DISTINCT q.OwnerUserId) AS "unique_users", SUM(CASE WHEN q.AcceptedAnswerId = a.Id THEN 1 ELSE 0 END) AS "accepted_answers", COUNT(DISTINCT CASE WHEN q.AcceptedAnswerId = a.Id THEN q.OwnerUserId END) AS "unique_users_who_accepted", SUM(q.ViewCount) AS "estimate_views_of_answers", SUM(CASE WHEN q.AcceptedAnswerId = a.Id THEN q.ViewCount ELSE 0 END) AS "estimate_views_of_accepted_answers" FROM Posts AS q INNER JOIN Posts AS a ON a.ParentId = q.Id WHERE a.OwnerUserId = '##UserId##' AND q.OwnerUserId != '##UserId##'