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Q&A for people interested in the history and origins of science and mathematics

select count(*)
from 
(
select u.id
from posts p join users u on p.OwnerUserId = u.Id
group by u.id
having count(case when PostTypeId=1 then 1 end)>0 and 
count(case when PostTypeId=2 then 1 end)=0
)x

fork query

edited aug 5

created aug 5 anonymous