Brad,

A code of ethics is a nice idea but without a governing body that we all have to join I believe it is entirely unenforceable. Also most of us work for an employer who sets the rules for our behavior. What if we sign a code of conduct and our employer asks us to do something that violates the DBA code of conduct? The employer is paying the bills. Also I would be strongly against any vendor, Microsoft, Oracle, etc., setting the code of conduct. Who says they are ethical?