Using SYS_REFCURSOR returned from function in a WHERE clause

Question

Hi All,
I have a plsql function that returns a SYS_REFCURSOR. Typically it will be three columns wide and 1 or more rows. I'd like to use it like:
SELECT *
FROM schema_name.table_name a
WHERE a.date_col BETWEEN trunc(add_months(SYSDATE,-12),'month') AND sysdate
AND ((a.col_a, a.col_b, a.col_c) IN (
open SYS_REFCURSOR returned by schema_name.package_name.function_name('x','y','z')
I've tried casting it to a table, but it complains about an invalid relational operator:
SELECT *
FROM schema_name.table_name a
WHERE a.date_col BETWEEN trunc(add_months(SYSDATE,-12),'month') AND sysdate
AND ((a.col_a, a.col_b, a.col_c) IN (TABLE(schema_name.package_name.function_name('x','y','z')))
Any suggestions would be appreciated!
Thanks,
Thomas

Answer 1

Regarding 3360's xml functionality:
SQL> create or replace function f
  2     return sys_refcursor
  3  as
  4     c   sys_refcursor;
  5  begin
  6     open c for
  7        select 7788 empno, 'SCOTT' ename from dual
  8        union all
  9        select 7900 empno, 'JAMES' ename from dual;
10
11     return c;
12  end f;
13  /
Function created.
SQL> select empno, ename
  2    from emp
  3   where (empno, ename) in
  4            (select extractvalue (column_value, 'ROW/EMPNO'),
  5                    extractvalue (column_value, 'ROW/ENAME')
  6               from table (xmlsequence (f)));
          EMPNO ENAME
           7788 SCOTT
           7900 JAMES