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WITH yourTable AS ( SELECT '001' AS Employee_ID, '123' AS Supervisor_ID UNION ALL SELECT '178', '123' UNION ALL SELECT '002', '178' UNION ALL SELECT '154', '178' UNION ALL SELECT '003', '154' UNION ALL SELECT '004', '201' UNION ALL SELECT '123', NULL ), cte AS ( SELECT Employee_ID, Supervisor_ID FROM yourTable WHERE Employee_ID = 123 UNION ALL SELECT t1.Employee_ID, t1.Supervisor_ID FROM yourTable t1 INNER JOIN cte t2 ON t1.Supervisor_ID = t2.Employee_ID ) SELECT Employee_ID FROM cte WHERE Employee_ID <> '123' ORDER BY Employee_ID;
Employee_ID
001
002
003
154
178