Find the dates on which more than one revisions were made.
SELECT date_of_latest_revision FROM Catalogs GROUP BY date_of_latest_revision HAVING count(*)  >  1
SELECT date_of_latest_revision FROM Catalogs GROUP BY date_of_latest_revision HAVING count(*)  >  1
[{'date_of_latest_revision': '2017-03-30 09:15:37'}, {'date_of_latest_revision': '2017-09-26 12:10:36'}, {'date_of_latest_revision': '2017-10-26 01:16:51'}, {'date_of_latest_revision': '2017-12-04 06:48:13'}]