On Thu, 16 May 2002, Josh Berkus wrote:
> Stephan,
>
> > AFAIK we don't actually have statement triggers right now, anyway,
> > but...
> > Actually, I guess an after trigger that just checked the new values
> > would
> > work as well, right? See if there exists more than one row with the
> > new
> > key value. The after trigger should fire after all the changes are
> > done
> > and in the worst case you could use constraint triggers and
> > deferment.
> > The hard part about this really is making it work with concurrent
> > modifications, and if you're willing to forgo that, it shouldn't be
> > too
> > bad.
>
> Thanks. I'll give your solution a try and see what the performance hit
> is.
>
> Is the Unique Constraint issue on the To-Do list?
I'm not sure. I know it's been mentioned in the past, so probably (too
lazy to look right now).