select t.y as y, t.m as m, (t.c-lag(t.c) over (order by t...

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Portuguese Language

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select t.y as y, t.m as m, (t.c-lag(t.c) over (order by t.y, t.m)) as d
from (select year(creationdate) as y, month(creationdate) as m, count(*) as c 
from posts group by year(creationdate), month(creationdate)) as t

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