Summary Column and repeating frames

Question

I have a report that shows customer orders(1 per page). If a customer orders 3 pizzas and 2 of them are identical, same size, same toppings, crust i want the quanitity column to sum as 2. So for this example instead of having 3 rows with two of them being identical with the quanity column dispalying 1 for each, I want 2 rows with quanity showing 2 for the identical pizzas and 1 for the other.
I have everything in the same group/repeating frame right now and it is showing all 3 pizzas on there own row. Do i need a summary column and change my groupings? How can i achieve this the summed quanity for identical orders?
CURRENT:
Crust......Toppings......size.....quantity
Thin.......Cheese........small....1
Thin.......Cheese........small....1
thick.......meat.........large....1
NEW:
Crust......Toppings......size.....quantity
Thin.......Cheese........small....2
thick.......meat.........large....1

Answer 1

Forget summary columns. This can easily be just a group by query:
with t as (select 'Thin' crust, 'Cheese' top ,'Small' sze, 1 qty from dual
           union all
           select 'Thin' , 'Cheese'  ,'Small' , 2 from dual
           union all
           select 'Thick' , 'Meat'  ,'Large', 1  from dual
select t.crust, t.top, t.sze, sum(qty)
from t
group by crust,top,sze;
CRUST TOP    SZE     SUM(QTY)
Thin  Cheese Small          3
Thick Meat   Large          1