Can we write function in select statement?

Question

i have function and it has Out parameter,so in this case can i write select statement for my function to retrieve the value?

Answer 1

Or, you could use pipelined function - i guess.
Like ->
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Elapsed: 00:00:00.00
satyaki>
satyaki>create or replace type a_obj as object
  2    (
  3       e_nm  varchar2(30),
  4       e_sal number(7,2)
  5    )
  6  /
Type created.
Elapsed: 00:00:00.00
satyaki>
satyaki>
satyaki>create or replace type a_rec as table of a_obj;
  2  /
Type created.
Elapsed: 00:00:00.00
satyaki>
satyaki>create or replace function multi_return(e_cd in number)
  2  return a_rec
  3  pipelined
  4  is
  5    cursor c1
  6    is
  7      select a_obj(ename, sal) as a_det_rec
  8      from emp
  9      where empno = e_cd;
10     
11      r1 c1%rowtype;
12  begin
13    for r1 in c1
14    loop
15      pipe row(r1.a_det_rec);
16    end loop;
17  
18    return ;
19  end;
20  /
Function created.
Elapsed: 00:00:00.01
satyaki>
satyaki>
satyaki>select * from table(cast(multi_return(&e_no) as a_rec));
Enter value for e_no: 7369
old   1: select * from table(cast(multi_return(&e_no) as a_rec))
new   1: select * from table(cast(multi_return(7369) as a_rec))
no rows selected
Elapsed: 00:00:00.02
satyaki>
satyaki>
satyaki>select * from emp;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO JOB1      DOB
      7521 WARD       SALESMAN        7698 22-FEB-81     226.88        500         30 SALESMAN
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1815       1400         30 SALESMAN
      7788 SCOTT      ANALYST         7566 19-APR-87     598.95                    20 ANALYST
      7839 KING       PRESIDENT            17-NOV-81       7260                    10 PRESIDENT
      7844 TURNER     SALESMAN        7698 08-SEP-81       2178          0         30 SALESMAN
      7876 ADAMS      CLERK           7788 23-MAY-87     159.72                    20 CLERK
      7900 JAMES      CLERK           7698 03-DEC-81     1379.4                    30 CLERK
      7902 FORD       ANALYST         7566 03-DEC-81    5270.76                    20 ANALYST
      7934 MILLER     CLERK           7782 23-JAN-82     1887.6                    10 CLERK
      7566 Smith      Manager         7839 23-JAN-82       1848          0         10 Manager   23-JAN-89
      7698 Glen       Manager         7839 23-JAN-82       1848          0         10 Manager   23-JAN-89
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO JOB1      DOB
      7599 BILLY      ANALYST         7566 10-JUN-09       4500                    30
12 rows selected.
Elapsed: 00:00:00.01
satyaki>
satyaki>select * from table(cast(multi_return(&e_no) as a_rec));
Enter value for e_no: 7698
old   1: select * from table(cast(multi_return(&e_no) as a_rec))
new   1: select * from table(cast(multi_return(7698) as a_rec))
E_NM                                E_SAL
Glen                                 1848
Elapsed: 00:00:00.00
satyaki>
satyaki>/
Enter value for e_no: 7599
old   1: select * from table(cast(multi_return(&e_no) as a_rec))
new   1: select * from table(cast(multi_return(7599) as a_rec))
E_NM                                E_SAL
BILLY                                4500
Elapsed: 00:00:00.00
satyaki>Regards.
Satyaki De.