Q&A for parents, grandparents, nannies and others with a parenting role
select distinct top 100 u.DisplayName, u.Id from Users u left join ( select u.DisplayName, u.Id from Users u join ( select p.OwnerUserId from Posts p where p.CreationDate between '2010-01-01' and '2010-12-31' ) t1 on t1.OwnerUserId = u.Id ) t2 on t2.Id = u.Id and t2.Id is null join ( select u.DisplayName, u.Id from Users u join ( select p.OwnerUserId from Posts p where p.CreationDate between '2015-01-01' and '2015-12-31' ) t1 on t1.OwnerUserId = u.Id ) t3 on t3.Id = u.Id