SELECT a.* from ARTICULOS a, MARCAS m, PROVEEDORES p WHERE m.Codigo=a.Cod_Marca and a.Proveedor=p.Codigo and m.Activo <> 'N' and a.Cod_Familia <> 0 and a.Borrado <> 'S' and p.Activo <> 'N' AND Cod_Subfamilia = 6 AND Cod_Subsubfamilia = 7 LIMIT 0, 20