select t1.y as y, t1.m as m, (lag(t1.c) over (order by t1...

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Portuguese Language

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select t1.y as y, t1.m as m,
(lag(t1.c) over (order by t1.y, t1.m)) as pred
from (select year(creationdate) as y, month(creationdate) as m, count(*) as c 
from posts where posttypeid between 1 and 2 
group by year(creationdate), month(creationdate)) as t1

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