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select
sum(case when ct<10 then 1 else 0 end) as one,
sum(case when ct>=10 and ct<=20 then 1 else 0 end) as two ,
sum(case when ct>20 then 1 else 0 end) as three
from (
select owneruserid, count(PostTypeId) ct
from posts
where PostTypeId= 1
group by owneruserid 
)d;

fork query

edited nov 30

created nov 30 anonymous