instruction: Users with the most edits of other users' posts in 2017.
response: SELECT a.UserId AS "user_link", COUNT(a.PostId) AS "Count", a.UserId AS "UserId" FROM PostHistory AS a INNER JOIN Posts AS b ON a.PostId = b.Id WHERE a.PostHistoryTypeId = 5 AND b.CreationDate < '2018-01-01' AND a.CreationDate >= '2017-01-01' GROUP BY a.UserId ORDER BY COUNT(a.PostId) DESC