Re: Is it safe to use DEFAULT currval()

On Saturday 27 September 2003 18:40, Tom Lane wrote:
> Richard Huxton <dev@archonet.com> writes:
> > CREATE TABLE foo (
> >   id       SERIAL,
> >   blah     text,
> >   tracking int4 DEFAULT currval('foo_id_seq')
> >   PRIMARY KEY (id)
> > );
> >
> > Now - it works, but is that a design feature or just luck?
>
> You're essentially assuming that the column expressions for an INSERT
> will be evaluated left-to-right.  That's true at the moment, and I don't
> see any foreseeable reason why we'd change it, but it surely is an
> implementation dependency that could bite you someday.

I feared as much. Ah well, use nextval(), a different sequence or write a
trigger I suppose.

--
  Richard Huxton
  Archonet Ltd