Bulk Collect Twice over same nested table - oracle

Question

Is there any way that after the second bulk collect, data does not get override of the first bulk collect. I don't want to iterate in loop.
DECLARE
TYPE abc IS RECORD (p_id part.p_id%TYPE);
TYPE abc_nt
IS
TABLE OF abc
INDEX BY BINARY_INTEGER;
v_abc_nt abc_nt;
BEGIN
SELECT p_id
BULK COLLECT
INTO v_abc_nt
FROM part
WHERE p_id IN ('E1', 'E2');
SELECT p_id
BULK COLLECT
INTO v_abc_nt
FROM part
WHERE p_id IN ('E3', 'E4');
FOR i IN v_abc_nt.FIRST .. v_abc_nt.LAST
LOOP
DBMS_OUTPUT.put_line (
'p_id is ' || v_abc_nt (i).p_id
);
END LOOP;
END;
OUTPUT:
p_id is E3
p_id is E4
Note: E1 and E2 is present in part table.

Answer 1

You can't simply add the data to the collection, no.
You can, however, do a BULK COLLECT into a separate collection and then combine the collections assuming that you really just need/ want a nested table rather than an associative array...
DECLARE
TYPE abc IS RECORD (p_id part.p_id%TYPE);
TYPE abc_nt
IS
TABLE OF abc;
v_abc_nt abc_nt;
v_abc_nt2 abc_nt;
BEGIN
SELECT p_id
BULK COLLECT
INTO v_abc_nt
FROM part
WHERE p_id IN ('E1', 'E2');
SELECT p_id
BULK COLLECT
INTO v_abc_nt2
FROM part
WHERE p_id IN ('E3', 'E4');
v_abc_nt := v_abc_nt MULTISET UNION v_abc_nt2;
FOR i IN v_abc_nt.FIRST .. v_abc_nt.LAST
LOOP
DBMS_OUTPUT.put_line (
'p_id is ' || v_abc_nt (i).p_id
);
END LOOP;
END;
If you really want to use an associative array, you would need to write some code because there is no way for Oracle to know automatically how to remap the associations of one array when you combine it with another associative array that has some of the same keys.

Answer 2

You can write it like this
bad example:
declare
type t_numb is record(
numb number);
type t_numb_list is table of t_numb;
v_numb_list t_numb_list;
begin
with q as
(select 1 a from dual union select 2 from dual union select 3 from dual)
select q.a bulk collect into v_numb_list from q;
with w as
(select 4 a from dual union select 5 from dual union select 6 from dual)
select w.a bulk collect into v_numb_list from w;
for r in 1 .. v_numb_list.count loop
dbms_output.put_line(v_numb_list(r).numb);
end loop;
end;
and this works good:
declare
type t_numb is record(
numb number);
type t_numb_list is table of t_numb;
v_numb_list t_numb_list := t_numb_list();
v_numb t_numb;
begin
for q in (select 1 a
from dual
union
select 2
from dual
union
select 3
from dual) loop
v_numb.numb := q.a;
v_numb_list.extend;
v_numb_list(v_numb_list.count) := v_numb;
end loop;
for w in (select 4 a
from dual
union
select 5
from dual
union
select 6
from dual) loop
v_numb.numb := w.a;
v_numb_list.extend;
v_numb_list(v_numb_list.count) := v_numb;
end loop;
for r in 1 .. v_numb_list.count loop
dbms_output.put_line(v_numb_list(r).numb);
end loop;
end;