ค้นหาชื่อช่องที่ออกอากาศในตอนเช้า
Find the names of the channels that are broadcast in the morning.
df_channel = pd.DataFrame(columns=['name', 'channel_id']); df_broadcast = pd.DataFrame(columns=['channel_id', 'time_of_day'])
df_channel[df_channel['channel_id'].isin(df_broadcast[df_broadcast['time_of_day'] == 'Morning']['channel_id'])]['name'].tolist()