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select mm,cnt as curr,prev,round(100-cnt*100.00/prev,2) prc
from (
select mm,cnt,lag(cnt) over (order by mm) prev
from (
select year(creationDate)*100+month(creationDate) as mm,
count(1) as cnt
from posts
where PostTypeId between 1 and 2
group by year(creationDate)*100+month(creationDate)
) A
) A
where cnt < prev
order by mm

fork query

edited dec 1

created dec 1 anonymous