ลูกค้าที่ไม่ได้เช่าภาพยนตร์หลังจาก '23-08-2548 02:06:01' มีชื่ออะไรบ้าง?
What are the first names of customers who have not rented any films after '2005-08-23 02:06:01'?
df_customer = pd.DataFrame(columns=['first_name', 'customer_id']); df_rental = pd.DataFrame(columns=['customer_id', 'rental_date'])
df_customer[~df_customer['customer_id'].isin(df_rental[df_rental['rental_date'] > '2005-08-23 02:06:01']['customer_id'])]['first_name']