Function that returns set of results

Question

Good morning!
I need to make a function that would return set of results (records). I need to do a SELECT statement on that function later. Could someone throw me an example how to do this. I would be very gratefull. Thanks.
EDIT: thing is i need to select list of objects that will match some complicated criteria and some mathematic calculations are needed (thats why i need to create a function).
Message was edited by:
user573095

Answer 1

Or an example with multiple columns....
SQL> CREATE OR REPLACE TYPE myrec AS OBJECT
  2  ( col1   VARCHAR2(10),
  3    col2   VARCHAR2(10)
  4  )
  5  /
Type created.
SQL>
SQL> CREATE OR REPLACE TYPE myrectable AS TABLE OF myrec
  2  /
Type created.
SQL>
SQL> CREATE OR REPLACE FUNCTION pipedata(p_str IN VARCHAR2) RETURN myrectable PIPELINED IS
  2    v_str VARCHAR2(4000) := REPLACE(REPLACE(p_str, '('),')');
  3    v_obj myrec := myrec(NULL,NULL);
  4  BEGIN
  5    LOOP
  6      EXIT WHEN v_str IS NULL;
  7      v_obj.col1 := SUBSTR(v_str,1,INSTR(v_str,',')-1);
  8      v_str := SUBSTR(v_str,INSTR(v_str,',')+1);
  9      IF INSTR(v_str,',')>0 THEN
10        v_obj.col2 := SUBSTR(v_str,1,INSTR(v_str,',')-1);
11        v_str := SUBSTR(v_str,INSTR(v_str,',')+1);
12      ELSE
13        v_obj.col2 := v_str;
14        v_str := NULL;
15      END IF;
16      PIPE ROW (v_obj);
17    END LOOP;
18    RETURN;
19  END;
20  /
Function created.
SQL>
SQL> create table mytab (col1 varchar2(10), col2 varchar2(10));
Table created.
SQL>
SQL> insert into mytab (col1, col2) select col1, col2 from table(pipedata('(1,2),(2,3),(4,5)'));
3 rows created.
SQL>
SQL> select * from mytab;
COL1       COL2
1          2
2          3
4          5