* This can be done by using Pragma called EXCEPTION_INIT.
* This gives the flexibility to the programmer to instruct the compiler to provide custom error messages based on the business logic by overriding the pre-defined messages during the compilation time.
Syntax :
DECLARE
exception_name EXCEPTION;
PRAGMA EXCEPTION_INIT (exception_name, error_code);
BEGIN
// PL/SQL Logic
EXCEPTION
WHEN exception_name THEN
// Steps to handle exception
END;
