select users.id_user, login, collections.id_collection, nom_collection from collections inner join users using(id_user) 
		where collections.id_collection='2437' and collections.id_user='994' and (collections.type_album='public' OR (collections.type_album='privé' AND collections.cle_visiteur=''))<hr>Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '='