В Срд, 21.07.2004, в 09:44, sad пишет:
> 4) Replication: to identify an object of ANY type (record of any table
> regardless to datamodel), to store lists of deleted or modified objects
> (regardless to datamodel)
That sounds like a datamodel on data that belongs to another data model,
and 5) applies.
> 5) Making a primary key: if there is no real key at all.
When there's no key at all, there can't be a surrogate key, as I
understand it. In such cases a generated unique number comes in handy,
and it's a real primary key and no surrogate key.
Спасибо
--
Markus Bertheau <twanger(at)bluetwanger(dot)de>