SQL - SELECT MAX() and accompanying field

Question

What I have is basically a problem which is easily solved with multiple tables, but I have only a single table to do it.

Consider the following database table

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Answer 1

select distinct
     *  
from    
   SomeTable a
inner join (
  select max(emailAddress), userId
  from
     SomeTable 
  group by 
     userId
) b on a.emailAddress = b.emailAddress and a.userId = b.userId