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UPDATE Employees SET manager_id = 108 WHERE dept_id = 1 AND emp_id NOT IN (108); UPDATE Employees SET manager_id = 109 WHERE emp_id IN (110,111,124,125,126,142,143); UPDATE Employees SET manager_id = ...
Problem: Starting from the HR department head (dept_id = 1, manager_id is NULL), list all employees in that reporting chain (head + all direct/indirect reports).