How to create a user_defined grouping function?

Question

I need to create a user_defined function and use it in my sql statement.
I know the user_defined function can be used anywhere the build-in function can be used.In oracle,there are grouping functions.
How can I create a user_defined grouping function and I can use it in my sql statement.

Answer 1

Hi, can you explain exactly what you are trying to achieve:
SQL> create or replace function my_func return number as
  2  begin
  3    return 5;
  4  end;
  5  /
Function created.
SQL> select deptno,my_func(),max(sal)
  2  from emp
  3  group by deptno,my_func()
  4  /
    DEPTNO  MY_FUNC()   MAX(SAL)
        10          5       5000
        20          5       3000
        30          5       2850