ค้นหารหัสประเภทนโยบายทั้งหมดที่เกี่ยวข้องกับลูกค้า "Dayana Robel"
Find all the policy type codes associated with the customer "Dayana Robel"
df_customers = pd.DataFrame(columns = ['customer_id', 'customer_details']); df_policies = pd.DataFrame(columns = ['policy_type_code', 'customer_id'])
result = df_policies.loc[df_policies['customer_id'].isin(df_customers[df_customers['customer_details'] == 'Dayana Robel']['customer_id']), 'policy_type_code']