Jeff Davis <pg...@j-davis.com> writes:
> Is it a problem to allow unique constraints to be deferrable until the
> end of the command though?
Yes. If you do have a case where this matters, the command updating the
referenced table is most likely different from the one updating the
referencing table, and so the command boundaries aren't the same.
I think what we can do for now is insist that the FK's unique constraint
be immediate-mode. Trying to relax that looks like a research project
to me.
regards, tom lane
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