text: -- Contacts with phone Format
  SELECT
      c.first_name AS Nombre,
      c.last_name AS Apellidos,
      c.birthdate AS Fecha,
      GROUP_CONCAT('(', p.phone_number, ', ', p.ptype, ')' SEPARATOR ', ') AS Teléfonos
  FROM
      contact c
          LEFT JOIN
      phone p USING(contact_id)
  GROUP BY c.contact_id;
  
  -- Contacts with email Format
  SELECT
      c.first_name AS Nombre,
      c.last_name AS Apellidos,
      c.birthdate AS Fecha,
      GROUP_CONCAT('(', e.eaddress, ', ', e.etype, ')' SEPARATOR ', ') AS Teléfonos
  FROM
      contact c
          LEFT JOIN
      email e USING(contact_id)
  GROUP BY c.contact_id;
  
  -- Example Format
  SELECT 
      cp.first_name AS Nombre,
      cp.last_name AS Apellidos,
      cp.birthdate AS Fecha,
      cp.phones AS Teléfonos,
      GROUP_CONCAT('(', e.eaddress, ', ', e.etype, ')' SEPARATOR ', ') AS Correos
  FROM
      (
          SELECT
              c.contact_id,
              c.first_name,
              c.last_name,
              c.birthdate,
              GROUP_CONCAT('(', p.phone_number, ', ', p.ptype, ')' SEPARATOR ', ') AS phones
          FROM
              contact c
                  LEFT JOIN
              phone p USING(contact_id)
          GROUP BY c.contact_id
      ) cp
          LEFT JOIN
      email e USING(contact_id)
  GROUP BY cp.contact_id;
  