select lender_libelle as Propriétaire, location_libelle as Localisation, codestat_libelle as "Code statistique", count(*) as Nombre from exemplaires, lenders, docs_location, docs_codestat where expl_owner=idlender and idlocation=expl_location and expl_codestat=idcode group by lender_libelle,location_libelle,codestat_libelle order by 1,2,3