Hierarchical Queries

Hierarchical Queries:

SELECT last_name "Employee", CONNECT_BY_ISCYCLE "Cycle",
   LEVEL, SYS_CONNECT_BY_PATH(last_name, '/') "Path"
   FROM employees
   WHERE level <= 3 AND department_id = 80
   START WITH last_name = 'King'
   CONNECT BY NOCYCLE PRIOR employee_id = manager_id AND LEVEL <= 4;

Employee                   Cycle  LEVEL Path
------------------------- ------ ------ -------------------------
Russell                        1      2 /King/Russell
Tucker                         0      3 /King/Russell/Tucker
Bernstein                      0      3 /King/Russell/Bernstein
Hall                           0      3 /King/Russell/Hall
Olsen                          0      3 /King/Russell/Olsen
Cambrault                      0      3 /King/Russell/Cambrault
Tuvault                        0      3 /King/Russell/Tuvault
Partners                       0      2 /King/Partners
King                           0      3 /King/Partners/King
Sully                          0      3 /King/Partners/Sully
McEwen                         0      3 /King/Partners/McEwen