Nick,
> What I want to do is make a field so that it requires a value after a
> change
> in another field to a particular value. Is this possible with the ADD
> CONSTRAINT command, or will I have to make a custom function and use
> a
> trigger.
That depends on how complicated your rules are. All constraints must
evaluate to a true/false statement, so complex procedures require a
function + trigger instead. How about posting some more details?
-Josh
