text: select nome_tipo 
  from Editam natural join Contem_Registos
  where mail='comba@mal.com';
  
  select distinct mail
  from Loga natural join Login
  where sucesso='nao';
  
  select data_nasc 
  from Pessoas 
  where mail in (
  	select mail 
  	from Contem_Registos 
  	natural join Editam
  	where nome_pagina = 'facebook' 
  	and mail in (
  		select mail 
  		from Contem_Registos 
  		natural join Editam 
  		where nome_registo = 'facebook'));
  