select u.DisplayName from users u where (select count(*) ...

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select u.DisplayName from users u where 
(select count(*) from posts p where p.CreationDate between '2010/01/01' and '2010/12/21' and p.OwnerUserId=u.id)=0 and (select count(*) from posts p where p.CreationDate between '2015/01/01' and '2015/12/31' and p.OwnerUserId=u.id)>0

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