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-- How close are you to getting the Archaeologist badge?
-- "Edited 100 posts that were inactive for 6 months"
DECLARE @UserId INT = ##UserId##;
SELECT COUNT(*) FROM Posts p
INNER JOIN Posts a on a.ParentId = p.Id
WHERE p.LastEditDate < DATEADD(month, -6, p.LastActivityDate)
AND( p.OwnerUserId = @UserId OR a.OwnerUserId = @UserId)