select sum(case when c < 10 then 1 else 0 end) L10, sum(c...

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select sum(case when c < 10 then 1 else 0 end) L10, 
       sum(case when c >= 10 and c < 20 then 1 else 0 end) L20,
       sum(case when c >= 20 then 1 else 0 end) G20 
    from (
        select OwnerUserId, count(*) c 
           from posts 
           where PostTypeId=1 
           group by OwnerUserId
         ) t1

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