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select *, t2."all"+t1."with_post" as "res"
from

(select count(distinct u.Id) as "with_post" from Users u
full outer join Posts p on (p.OwnerUserID = u.Id)
where p.Id is null)t1

cross join

(select count(u.Id) as "all" from Users u)t2
;

fork query

edited dec 9

created dec 8 anonymous