select DataYear, DataMonth, cnt, prev, round(100-cnt*100....

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Portuguese Language

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select DataYear, DataMonth, cnt, prev, round(100-cnt*100.00/prev,2) prc
from (
select datayear, DataMonth, cnt, lag(cnt) over (order by datayear, DataMonth) prev
from (
select year(creationdate) as DataYear, month(creationdate) as DataMonth,
count(*) as cnt
from posts
where posttypeid between 1 and 2
group by year(creationdate), month(creationdate)
) as marker
) as marker2
where cnt<prev
order by DataYear, DataMonth

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