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SELECT x.year y, x.month m, 100 - Cast(x.posts as money)/Cast(x1.posts as
money)*100 perc FROM
(SELECT Year(CreationDate) year, Month(CreationDate) month,
Count(PostTypeId) posts
FROM Posts GROUP BY Year(CreationDate) , Month(CreationDate)) x
JOIN (SELECT Year(CreationDate) year, Month(CreationDate) month,
Count(PostTypeId) posts
FROM Posts GROUP BY Year(CreationDate) , Month(CreationDate)) x1
on x.year =x1.year and x.month - x1.month = 1 and x.posts < x1.posts ORDER BY
y,m

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edited dec 1

created dec 1 anonymous