Comment extraire les attributs lecteurs?

SELECT
  borrowers.borrowernumber,
  borrowers.surname,
  borrowers.firstname,
  borrowers.cardnumber,
  borrower_attributes.code,
  borrower_attributes.attribute
FROM borrowers
LEFT JOIN borrower_attributes ON (borrowers.borrowernumber=borrower_attributes.borrowernumber)
LEFT JOIN borrower_attribute_types ON (borrower_attribute_types.code=borrower_attributes.code)
GROUP BY borrower_attributes.attribute
ORDER BY borrowers.surname, borrowers.firstname ASC

Résultat :