Andreas Joseph Krogh, 05.02.2013 11:15:
> Andreas Joseph Krogh, 05.02.2013 10:57:
> > The value of having NOT NULL deferrable is, well, to not check for
> > NULL until the tx commits. When working with ORMs this often is the
> > case, especially with circular FKs.
>
> With circular FKs it's enough to define the FK constraint as deferred.
>
> I meant; circular FKs which are also NOT NULL
A deferrable FK is still enough for that scenario as you can insert FK values that do not yet exist.
See Alban's answer for an example.