Find duplikerede poster i MySQL

Nøglen er at omskrive denne forespørgsel, så den kan bruges som en underforespørgsel.

SELECT firstname, 
   lastname, 
   list.address 
FROM list
   INNER JOIN (SELECT address
               FROM   list
               GROUP  BY address
               HAVING COUNT(id) > 1) dup
           ON list.address = dup.address;