-- https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/SELECT.html
SELECT LPAD(' ',2*(LEVEL-1)) || last_name org_chart, 
employee_id, manager_id, job_id 
    FROM employees
    START WITH job_id = 'AD_PRES' 
    CONNECT BY PRIOR employee_id = manager_id AND LEVEL <= 2;