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DECLARE @PostCountByMonth TABLE ( [date] datetime, [count] int, UNIQUE CLUSTERED ([date]) ); INSERT INTO @PostCountByMonth SELECT dateadd(month, DATEDIFF(month, '', p.CreationDate), '') [date], count(*) [count] FROM Posts p GROUP BY DATEDIFF(month, '', p.CreationDate) ORDER BY DATEDIFF(month, '', p.CreationDate); SELECT p1.[date], sum(p2.[count]) [trend] FROM @PostCountByMonth p1 INNER JOIN @PostCountByMonth p2 ON p1.[date] >= p2.[date] GROUP BY p1.[date]