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select y, m, (a - b + 0.0) / a * 100
from (
  select y, m, c as b, lag(c) over (order by y DESC, m) as a
  from (
    select year(CreationDate) as y, 
           month(CreationDate) as m, 
           count(id) as c
    from posts
    group by year(CreationDate), month(CreationDate)
  ) q
) q2

fork query

edited nov 26

created nov 25 anonymous