select mounth,cnt as curr,prev,round(100-cnt*100.00/prev,...

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Portuguese Language

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

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