select count(*) from ( select u.id from posts p join user...

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History of Science and Math

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

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