There is a way of using a FOR loop with the associative arrays INDEX BY BINARY_INTEGER
SQL>
SQL> declare
2 type dept_rty is record(id number, extra_tx VARCHAR2(2000));
3 type dept_aa is table of dept_rty index by binary_integer;
4 v_dept_aa dept_aa;
5 begin
6 v_dept_aa(10).id :=10;
7 v_dept_aa(20).id :=20;
8
9 for i in v_dept_aa.first..v_dept_aa.last loop
10 if v_dept_aa.exists(i) then
11 DBMS_OUTPUT.put_line(v_dept_aa(i).id);
12 end if;
13 end loop;
14 end;
15 /
10
20
PL/SQL procedure successfully completed.
SQL>