select count(id) from (select a.id from (select users.i...

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--select * from posttypes;


select count(id) from 
  (select a.id from
    (select users.id from users 
    join posts p on users.id = p.OwnerUserId and PostTypeId = 1
    group by users.id) a
    left outer join posts on a.id = posts.OwnerUserId and PostTypeId = 2
    where posts.id is not NULL
) b

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