create table emp as select * from scott.emp;

set autotrace traceonly exp;

select job, mgr from emp
minus
select job, mgr from emp
where  deptno = 10 ;


alter session set "_convert_set_to_join" = true;

select job, mgr from emp
minus
select job, mgr from emp
where  deptno = 10 ;

select distinct job, mgr from emp e
where  not exists (
  select 'x' from emp
  where  deptno = 10
  and    sys_op_map_nonnull(job) = sys_op_map_nonnull(e.job)
  and    sys_op_map_nonnull(mgr) = sys_op_map_nonnull(e.mgr) 
) ;

