Código SQL [-]select QQ9EMP, QQ9CON, max(QQ9REN) as REN from tabla23 where QQ9EMP=524 and QQ9CON =14 group by QQ9EMP, QQ9CON
select QQ9EMP, QQ9CON, max(QQ9REN) as REN from tabla23 where QQ9EMP=524 and QQ9CON =14 group by QQ9EMP, QQ9CON