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SQL Query to identify loop in the Employee - Supervisor hierarchy in Oracle Applications

SELECT a.business_group_id, 
       LEVEL                                        level1, 
       connect_by_root supervisor_emp_no            top_supervisor, 
       connect_by_iscycle                           loopback, 
       connect_by_root supervisor_id                AS top_supervisor_id, 
       Sys_connect_by_path (supervisor_emp_no, '/') PATH 
FROM   (SELECT papf.business_group_id, 
               papf1.employee_number                        supervisor_emp_no, 
               papf1.full_name                              supervisor, 
               hr_general.Decode_position(paaf.position_id) position 
        FROM   per_all_people_f papf, 
               per_all_assignments_f paaf, 
               per_all_people_f papf1 
        WHERE  papf.person_id = paaf.person_id 
               AND papf1.person_id = paaf.supervisor_id 
               AND papf.current_employee_flag = 'Y' 
               AND paaf.primary_flag = 'Y' 
               AND papf.business_group_id = paaf.business_group_id 
               AND papf1.business_group_id = papf.business_group_id 
               AND Trunc(SYSDATE) BETWEEN papf.effective_start_date AND 
               AND Trunc(SYSDATE) BETWEEN paaf.effective_start_date AND 
               AND Trunc(SYSDATE) BETWEEN papf1.effective_start_date AND 
                                          papf1.effective_end_date) a 
WHERE  connect_by_iscycle > 0 
CONNECT BY NOCYCLE PRIOR a.person_id = a.supervisor_id 
ORDER  SIBLINGS BY a.person_id; 


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