Yes, it would be nice if the explanation explained what the bitwise compound assignment operators were especially since those were the real challenge of the question. Even the link...
I would change "Because of the IDENTITY attribute, no duplicate values for PersonID will occur" to "Because of the IDENTITY attribute, no duplicate values for PersonID can[/i] occur."
Now it's even more confusing - the question has changed; the answer has changed from predicate to operator which I don't think is correct with the new question; and, the...