แสดงรหัสลูกค้าและชื่อโดยไม่ต้องใช้บัตรเครดิต
Show the customer ids and firstname without a credit card.
df1 = pd.DataFrame(columns=['customer_id']); df2 = pd.DataFrame(columns=['customer_first_name', 'customer_id']); df3 = pd.DataFrame(columns=['customer_id', 'customer_first_name', 'card_type_code'])
df2[~df2['customer_id'].isin(df3[df3['card_type_code'] == 'Credit']['customer_id'])][['customer_id', 'customer_first_name']]