Question

I have sql such as:

select 
  c.customerID, sum(o.orderCost) 
from customer c, order o 
where c.customerID=o.customerID 
group by c.customerID;

This returns a list of

customerID, orderCost

where orderCost is the total cost of all orders the customer has made. I want to select the customer who has paid us the most (who has the highest orderCost). Do I need to create a nested query for this?

Answer 1

You need to create nested query for this.
Two queries.