15일차 # 7-7: Top-Down vs. Bottom-Up

 - PRIOR가 붙은 쪽이 parent row 임을 뜻함

  * Top-Down: PK에 PRIOR

select *

from emp

start with empno =  7839    

connect by prior empno = mgr;

  * Bottom-Up: FK에 PRIOR

select *

from emp

start with empno =  7521    

connect by empno = prior mgr;