SQL SUM operation of multiple subqueries

Question

i have the following mysql database table designed,

ticket(id, code, cust_name);
passenger(id, ticket_id, name, age, gender, fare);
service(id, passenger_id,         


        

Answer 1

How about this?

with fares as(
select p.id id, p.ticket_id ticket_id, sum(coalesce(s.cost,0)) cost
  from passenger p left outer join service s
       on p.id = s.passenger_id
 group by p.id, p.ticket_id)
select q.ticket_id, sum(f.cost), sum(q.fare), sum(f.cost + q.fare)
  from fares f inner join passenger q
       on f.id = q.id
 group by q.ticket_id;