Basic Oracle Concepts and Programming Question:

You can define a function that takes parameters, provide values to those parameters when calling the function. Here is a good example of a function with a parameter:

SQL> CREATE OR REPLACE FUNCTION GET_DOUBLE(X NUMBER)
2 RETURN NUMBER AS
3 BEGIN
4 RETURN X * 2;
5 END;
6 /
Function created.

SQL> SELECT GET_DOUBLE(36) FROM DUAL;
GET_DOUBLE(36)
--------------
72