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CREATE TYPE empno_tbl 
    IS TABLE OF NUMBER;
/
CREATE OR REPLACE FUNCTION get_empnos
  RETURN empno_tbl
IS
  l_empnos empno_tbl;
BEGIN
  SELECT empno
    BULK COLLECT  INTO l_empnos
    FROM emp;
  RETURN l_empnos; 
  
END;
 
/
select * from  table(get_empnos() )  ;
/
select 2 from dual where (7369,7499) in (select * from table(get_empnos()));