postgresql@get-experience.com writes:
> Den 15. juli 2017 23:15, skrev Tom Lane:
>> Perhaps you could make your PK be on (id, valid_from, valid_to).
> Doesn't really work because valid_to would change on UPDATE. I'd need to
> update foreign relations with another trigger which would be very ugly.
Um ... wouldn't ON UPDATE CASCADE help?
regards, tom lane