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Asked: 2026-05-11T05:27:21+00:00

I want to write a funcion or procedure that can be used in the

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I want to write a funcion or procedure that can be used in the IN clause of another procedure. The function or procedure would return ID numbers.

The main procedure would say something like 

SELECT * FROM EMPLOYEES WHERE OFFICE_ID IN (GET_OFFICE_IDS);  -- GET_OFFICE_IDS requires no parameters

GET_OFFICE_IDS returns a VARCHAR2 with the ID separated by commas. When I run the main procedure, I get a ‘ORA-01722: invalid number’ error which makes sense but I don’t know where I need to go from here.

Do I need GET_OFFICE_IDS to create a temp table that the main procedure uses? If so, will there be a performance penalty?

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  1. Here is a working example of the nested table solution, using the EMP table:

    create type t_ids is table of integer /  create or replace function get_office_ids return t_ids is    l_ids t_ids := t_ids();    l_idx integer := 0; begin    for r in (select empno from emp where deptno=10)    loop       l_ids.extend;       l_idx := l_idx+1;       l_ids(l_idx) := r.empno;    end loop;    return l_ids; end; /  select ename from emp where empno in (select * from table(get_office_ids));   ENAME ---------- CLARK KING TEST MILLER BINNSY FARMER
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