แสดงรหัสพนักงานที่ไม่อนุญาตให้ทำลายเอกสารใดๆ
Show the ids of the employees who don't authorize destruction for any document.
df_docs_destroyed = pd.DataFrame(columns=['employee_id', 'Destruction_Authorised_by_Employee_ID']); df_employees = pd.DataFrame(columns=['employee_id', 'Destruction_Authorised_by_Employee_ID'])
df_employees[~df_employees['employee_id'].isin(df_docs_destroyed['Destruction_Authorised_by_Employee_ID'])]['employee_id']