create or replace procedure test
is
    res number := 0;
begin

    dbms_output.put_line('Test date: 10-09-2009');
    res := emp_count(to_date('10-09-2009', 'dd-mm-yyyy'));
    dbms_output.put_line('Result: ' || res);
    dbms_output.put_line('Records: ');
    for vres in (
        select * from emp_work_ranges 
            where to_date('10-09-2009', 'dd-mm-yyyy') between
                employment_date and
                decode(dismissal_date,'',sysdate,dismissal_date)
    ) loop
        dbms_output.put_line(vres.id || ' ' || vres.emp_id || ' ' ||
            vres.employment_date || ' ' || vres.dismissal_date);
    end loop;
end;
/