หาเจ้าของโปรแกรมที่มีบางโปรแกรมทั้งช่วงเช้าและกลางคืน
find the program owners that have some programs in both morning and night time.
df_broadcast = pd.DataFrame(columns=['program_id', 'Time_of_day']); df_program = pd.DataFrame(columns=['owner', 'program_id'])
df_program[df_program['program_id'].isin(df_broadcast[df_broadcast['Time_of_day'] == 'Morning']['program_id']) & df_program['program_id'].isin(df_broadcast[df_broadcast['Time_of_day'] == 'Night']['program_id'])]['owner']