How to use a constant defined as a concat of char values in an IN clause

Question

Greetings,
I defined a CONSTANT as a concatenation of values and attempted to use it in an IN clause without success ...
CREATE OR REPLACE PACKAGE PKG_TEST AS
Q_IDS CONSTANT VARCHAR2(25) : = '''3'''||','||'''14'''||','||'''16'''||','||'''18'''||','||'''24''';
procedure insert_test;
END PKG_TEST;
CREATE OR REPLACE PACKAGE BODY PKG_TEST AS
PROCEDURE insert_test as
BEGIN
insert into test1
select *
from test_table
where q_id in ( Q_IDS );
END insert_test;
END PKG_TEST;
I'm guessing this doesn't work because the CONSTANT is being treated as one long string as opposed to a succession of comma separated values.
Is there a way to do this?
Any feedback would be appreciated.
Thank you.

Answer 1

One example:
SQL> ed
Wrote file afiedt.buf
  1  select *
  2  from emp
  3  where ename in (
  4    with t as (select '&input_string' as txt from dual)
  5    select REGEXP_SUBSTR (txt, '[^,]+', 1, level)
  6    from t
  7    connect by level <= length(regexp_replace(txt,'[^,]*'))+1
  8*   )
SQL> /
Enter value for input_string: SCOTT,JAMES
old   4:   with t as (select '&input_string' as txt from dual)
new   4:   with t as (select 'SCOTT,JAMES' as txt from dual)
     EMPNO ENAME      JOB              MGR HIREDATE                   SAL       COMM     DEPTNO
      7788 SCOTT      ANALYST         7566 19-04-1987 00:00:00       3000                    20
      7900 JAMES      CLERK           7698 03-12-1981 00:00:00        950                    30
SQL>