select /*+ leading(emp) */ * from emp 
where deptno in (select /*+ unnest */ deptno from dept);

select /*+ leading(dept) */ * from emp 
where deptno in (select /*+ unnest */ deptno from dept);

select /*+ ordered */ * from emp 
where deptno in (select /*+ unnest */ deptno from dept);

select /*+ leading(dept@qb1) */ * from emp 
where deptno in (select /*+ unnest qb_name(qb1) */ deptno from dept);

