Show the ids of all employees who have authorized destruction.
SELECT DISTINCT Destruction_Authorised_by_Employee_ID FROM Documents_to_be_destroyed
SELECT DISTINCT Destruction_Authorised_by_Employee_ID FROM Documents_to_be_destroyed
[{'Destruction_Authorised_by_Employee_ID': 156}, {'Destruction_Authorised_by_Employee_ID': 55}, {'Destruction_Authorised_by_Employee_ID': 183}, {'Destruction_Authorised_by_Employee_ID': 38}, {'Destruction_Authorised_by_Employee_ID': 123}, {'Destruction_Authorised_by_Employee_ID': 30}]