แผนกใดมีมากกว่า 1 หัวต่อครั้ง? ระบุรหัส ชื่อ และจำนวนหัว
Which department has more than 1 head at a time? List the id, name and the number of heads.
management_df = pd.DataFrame(columns=['department_id']); department_df = pd.DataFrame(columns=['department_id', 'name'])
department_df[department_df['department_id'].isin(management_df['department_id'].value_counts()[management_df['department_id'].value_counts() > 1].index)][['department_id', 'name']]