ข้อมูลคอมพิวเตอร์เปิดสอนกี่หลักสูตร ฝ่ายระบบ?
How many courses are offered by the Computer Info. Systems department?
df_course = pd.DataFrame(columns=['dept_code']); df_department = pd.DataFrame(columns=['dept_code'])
df_department.merge(df_course, on='dept_code').loc[df_department['dept_name'] == 'Computer Info. Systems'].shape[0]