SQL>
SQL> CREATE OR REPLACE FUNCTION grpval (
2 tab IN VARCHAR2,
3 col IN VARCHAR2,
4 grpfunc IN VARCHAR2,
5 whr IN VARCHAR2 := NULL)
6 RETURN VARCHAR2
7 IS
8 retval VARCHAR2(32767);
9 BEGIN
10 EXECUTE IMMEDIATE
11 'SELECT ' || yourfunction || '(' || col || ')
12 FROM ' || tab || ' WHERE ' || NVL (whr, '1=1')
13 INTO retval;
14 RETURN retval;
15 END;
16 /
Function created.
SQL>