MySQL Inner join and sum two columns

Question

I have the following tables

TABLE: appointments

ID | PRICE | PAID
48 |  100  | 180

TABLE: appointments_product

Answer 1

select a.ID,a.PRICE,a.PAID,a.id as AppId,
       sum(b.total) as ProdTotal 
from appointments a 
INNER JOIN appointments_products b ON a.id = b.appointment_id
group by a.ID,a.PRICE,a.PAID;