-- Query 19

SELECT
    serveur.numserveur,
    serveur.nomserveur,
    COUNT(facture.numfacture) AS "nb factures"
FROM
    facture
INNER JOIN serveur ON serveur.numserveur = facture.numserveur
GROUP BY serveur.numserveur
HAVING COUNT(facture.numfacture) >= 5
ORDER BY serveur.numserveur DESC;

/* == RESULT ==
"numserveur","nomserveur","nb factures"
53,"Pillot Alain",16
52,"Martin Cathy",12
*/