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SELECT Month, SUM(Count) AS Count FROM ( SELECT DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) AS Month, COUNT(*) AS Count FROM Votes GROUP BY DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) UNION SELECT DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) AS Month, COUNT(*) AS Count FROM PostFeedback GROUP BY DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) ) q GROUP BY Month ORDER BY Month DESC