Hallo Tom,

> Morus Walter <morus.walter...@googlemail.com> writes:
> > are there downsides of making foreign keys deferrable (but initially
> > immediate) for updates, when the transaction does not set the
> > constraint behaviour to deferred?
> 
> > I'd expect that to have the same behaviour as non deferrable foreign
> > keys.
> > What I don't understand is, why is non deferrable the default, then.
> 
> Because the SQL standard says so. 

Ok. Understood.

> I don't believe there is any actual
> penalty for deferrable within the PG implementation, but perhaps there
> is in other systems' implementations.
> 

Thanks a lot for your help.

Morus


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