Question

I have two user defined collection types. The first type has the columns:

CREATE OR REPLACE
TYPE collection_1 as OBJECT
(
currency_code   varchar2(30),
amount   number
)

I have populated this collection inside a stored procedure using oracle bulk collect.So now let us say, the collection has values like this:

currency_code     amount
CAD               100
USD               50
CAD                120
USD               30

Now I want perform some aggregate functions on this collection and populate another collection that will store the total amount per currency. So I defined another collection like this:

CREATE OR REPLACE
TYPE collection_2 as OBJECT
(
currency_code   varchar2(30),
total_amount   number
)

And initialized it like this:

currency_code    total_amount
CAD               0
USD               0
GBP               0

Now I want to iterate over the collection_1 and populate collection_2 so that collection_2 reads like this:

currency_code    total_amount
CAD               220              --i.e.100+120
USD               80
GBP               0

How can I do it?

Answer 1

May be something like this.

declare
    TYPE t_coll_1 is TABLE OF collection_1;
    v_coll_1    t_coll_1;

    TYPE t_coll_2 is TABLE OF collection_2;
    v_coll_2          t_coll_2;

begin
    /* populate v_coll_1 */
    /* populate v_coll_2 */

    for i in v_coll_2.first.. v_coll_2.last
    loop
       for j in v_coll_1.first.. v_coll_1.last
       loop
          if v_coll_2(i).currency_code = v_coll_1(j).currency_code
          then
              v_coll_2(i).total_amount := v_coll_2(i).total_amount + v_coll_1(j).total_amount;
          end if;
       end loop;
    end loop;
end;