Re: null foreign key column

On Wed, 12 Feb 2003, Vernon Wu wrote:

>
> 12/02/2003 2:24:49 PM, Dmitry Tkach <dmitry(at)openratings(dot)com> wrote:
>
> >You don't want it to be serial - just make it 'person_id in'
>
> Any reasons?

serial is an auto-increment datatype. In your table, you probably want to
control what person_id is, rather than letting them mindlessly
auto-increment row after row, given it is a foreign key to a Person table.

>
> >
> >I hope, it helps...
> >
> >Dima
> >
> >Arunachalam Jaisankar wrote:
> >> This is a multi-part message in MIME format.
> >>
> >> ------=_NextPart_000_0005_01C2D1EE.61998D70
> >> Content-Type: text/plain;
> >> charset="iso-8859-1"
> >> Content-Transfer-Encoding: quoted-printable
> >>
> >> Hi all,
> >>
> >> I would like to have a foreign key column in my table which allows null val=
> >> ue also.
> >> But the below create table sql command doesn't accept null value for person=
> >> _id.
> >> How to do in postgres?
> >>
> >> create table event
> >> (
> >> event_id serial not null,
> >> event_description char(255) ,
> >> person_id serial ,
> >> primary key (event_id),
> >> foreign key (person_id)
> >> references person (person_id)
> >> );
> >>
> >> regards
> >> Jai