How to Make FUNCTION to return multiple column and multiple row output

Question

Hi All,
Kindly Share ur Idea;Thanks in Advance;
i Have Table Demo.
table DEMO:
id name
1 a10
1 a11
1 a12
2 b10
2 b11
3 ccc
and the function is like:
create or replace function (p1 number) return varchar2 as
vid number;
vname varchar2(20);
begin
select id,name into vid,vname from demo where id=p1;
return v1;
end;
this function returns output for id=3;
BUT,
i need output as (for input as 1)
vid vname
1 a10
1 a11
1 a12

Answer 1

A function returns a single datatype.
That datatype may be an atomic datatype (varchar2, number etc.) or it may be an object/record datatype, or even a collection datatype.
Where are you going to use this function? In PL/SQL or SQL?
If you are wanting to use it in SQL, then you would need a pipelined function e.g.
SQL> CREATE OR REPLACE TYPE myemp AS OBJECT
  2  ( empno    number,
  3    ename    varchar2(10),
  4    job      varchar2(10),
  5    mgr      number,
  6    hiredate date,
  7    sal      number,
  8    comm     number,
  9    deptno   number
10  )
11  /
Type created.
SQL> CREATE OR REPLACE TYPE myrectable AS TABLE OF myemp
  2  /
Type created.
SQL> CREATE OR REPLACE FUNCTION pipedata(p_min_row number, p_max_row number) RETURN myrectable PIPELINED IS
  2    v_obj myemp := myemp(NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL);
  3  BEGIN
  4    FOR e IN (select *
  5              from (
  6                    select e.*
  7                          ,rownum rn
  8                    from (select * from emp order by empno) e
  9                   )
10              where rn between p_min_row and p_max_row)
11    LOOP
12      v_obj.empno    := e.empno;
13      v_obj.ename    := e.ename;
14      v_obj.job      := e.job;
15      v_obj.mgr      := e.mgr;
16      v_obj.hiredate := e.hiredate;
17      v_obj.sal      := e.sal;
18      v_obj.comm     := e.comm;
19      v_obj.deptno   := e.deptno;
20      PIPE ROW (v_obj);
21    END LOOP;
22    RETURN;
23  END;
24  /
Function created.
SQL> select * from table(pipedata(1,5));
     EMPNO ENAME      JOB               MGR HIREDATE                    SAL       COMM     DEPTNO
      7369 SMITH      CLERK            7902 17-DEC-1980 00:00:00        800                    20
      7499 ALLEN      SALESMAN         7698 20-FEB-1981 00:00:00       1600        300         30
      7521 WARD       SALESMAN         7698 22-FEB-1981 00:00:00       1250        500         30
      7566 JONES      MANAGER          7839 02-APR-1981 00:00:00       2975                    20
      7654 MARTIN     SALESMAN         7698 28-SEP-1981 00:00:00       1250       1400         30
SQL> select * from table(pipedata(6,10));
     EMPNO ENAME      JOB               MGR HIREDATE                    SAL       COMM     DEPTNO
      7698 BLAKE      MANAGER          7839 01-MAY-1981 00:00:00       2850                    30
      7782 CLARK      MANAGER          7839 09-JUN-1981 00:00:00       2450                    10
      7788 SCOTT      ANALYST          7566 19-APR-1987 00:00:00       3000                    20
      7839 KING       PRESIDENT             17-NOV-1981 00:00:00       5000                    10
      7844 TURNER     SALESMAN         7698 08-SEP-1981 00:00:00       1500          0         30
SQL> select * from table(pipedata(11,15));
     EMPNO ENAME      JOB               MGR HIREDATE                    SAL       COMM     DEPTNO
      7876 ADAMS      CLERK            7788 23-MAY-1987 00:00:00       1100                    20
      7900 JAMES      CLERK            7698 03-DEC-1981 00:00:00        950                    30
      7902 FORD       ANALYST          7566 03-DEC-1981 00:00:00       3000                    20
      7934 MILLER     CLERK            7782 23-JAN-1982 00:00:00       1300                    10
SQL>If you are using it in PL/SQL then just populating a collection datatype and returning that will do. Though you should question why you want to pass large amounts of data around like that first.
Explain your purpose and what you are intending to do and we can recommend the best way.
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