Urgent help with Updating data

Question

I have two tables
D.S of table1 is
invoice date vendor
2233 11/1/2003 Microsoft
2244 11/1/2003 IBM
2255 11/1/2003 APPLE
a2233 11/1/2003 PCS
The primary key is the invoice and vendor.
This has like 100 rows.
Then the other table has
id invoice referno trans1 trans2 trans3
2233 a1234 20 30 40
2233 a1345 20 20 20
2233 a1456 20 10 10
2233 a1444 10 1 50
2244 a3333 10 1 20
2244 a4444 20 1 1
and so on and this one has thousands od entries
I need to add a primary key on this table because i do not have one so i added id column in there now i need to update id i.e enter data in that which if with a composite primary key constraint with invoice will have values like 1,2,3,4 like
id invoice referno trans1 trans2 trans3
1 2233 a1234 20 30 40
2 2233 a1345 20 20 20
3 2233 a1456 20 10 10
4 2233 a1444 10 1 50
1 2244 a3333 10 1 20
2 2244 a4444 20 1 1
--- and so on
Can someone tell me a query to update this table field id so that i have data like that and then i can add a composite key constraint on that.
Thanks
Ashish

Answer 1

use this instead:
declare
cursor l_cu_rec IS
select distinct invoice_no from table 1;
cursor l_cu_rec2(p_invoice_no VARCHAR2) IS
select rowid as row_id from table2
where invoice_no=p_invoice_no;
p NUMBER;
BEGIN
for i in l_cu_rec LOOP
p:= 0;
for j in l_cu_rec2(i.invoice_no) LOOP
p:= p+1;
update table2
set id=p
where rowid=j.row_id;
end loop;
end loop;
commit;
end;
I hope this will work.