ลูกค้าที่มีชื่อจริงว่า Carole และนามสกุลเป็น Bernhard อาศัยอยู่ในประเทศใด
Which country does customer with first name as Carole and last name as Bernhard lived in?
df_addresses = pd.DataFrame(columns=['country', 'address_id'])
df_customers = pd.DataFrame(columns=['customer_address_id', 'first_name', 'last_name'])
df_addresses[df_addresses['address_id'].isin(df_customers[(df_customers['first_name'] == 'Carole') & (df_customers['last_name'] == 'Bernhard')]['customer_address_id'])]['country'].iloc[0]