Show the ids of all employees who have either destroyed a document or made an authorization to do this.
SELECT Destroyed_by_Employee_ID FROM Documents_to_be_destroyed UNION SELECT Destruction_Authorised_by_Employee_ID FROM Documents_to_be_destroyed
SELECT Destroyed_by_Employee_ID FROM Documents_to_be_destroyed UNION SELECT Destruction_Authorised_by_Employee_ID FROM Documents_to_be_destroyed
[{'Destroyed_by_Employee_ID': 30}, {'Destroyed_by_Employee_ID': 38}, {'Destroyed_by_Employee_ID': 55}, {'Destroyed_by_Employee_ID': 99}, {'Destroyed_by_Employee_ID': 123}, {'Destroyed_by_Employee_ID': 136}, {'Destroyed_by_Employee_ID': 138}, {'Destroyed_by_Employee_ID': 156}, {'Destroyed_by_Employee_ID': 173}, {'Destroyed_by_Employee_ID': 183}]