SELECT LIE_NOM AS "Nom Lieu", COUNT(LIE_NOM) AS "Nombre Candidats"
FROM cc_lieu
JOIN cc_personne ON PER_LIE_ID = LIE_ID
JOIN cc_course ON COU_PER_ID = PER_ID
       WHERE COU_ANNEE = '2015'
       GROUP BY LIE_NOM
       ORDER BY COUNT(LIE_NOM) DESC
       LIMIT 1