Re: Correct Syntax for alter table ..add constraint

Josh Berkus wrote:

> Najm,
>
> > references age_list(id);
> > And I get the following error:
> > flipr=# alter table users
> > flipr-# add constraint age_fk foreign key(age) references
> > age_list(id);
> > NOTICE:  ALTER TABLE ... ADD CONSTRAINT will create
> > implicit trigger(s)
> > for FOREIGN KEY check(s)
> > ERROR:  <unnamed> referential integrity violation - key
> > referenced from
> > users not found in age_list
>
> Simple ... you have values in the AGE column that are not in
> the age_list table.  Thus you're in violation of the foriegn
> key you're trying to establish.
>
> -Josh Berkus

HI  Josh,
All values in age column of  are null..... I have no value there......
and I have specified to accetp nulls i.e.  I dont have constraint not
null on this particular column...
Najm