instruction: Questions favorited multiple times by the same users.
response: SELECT PostId AS "post_link", UserId AS "user_link", COUNT(*) AS "duplication_level", MIN(CreationDate) AS MinDate, MAX(CreationDate) AS MaxDate, DATEDIFF(day, MIN(CreationDate), MAX(CreationDate)) FROM Votes WHERE VoteTypeId = 5 GROUP BY PostId, UserId HAVING COUNT(*) > 1 AND DATEDIFF(day, MIN(CreationDate), MAX(CreationDate)) > 0 ORDER BY COUNT(*) DESC