I can't think of a reason I'd design a table today (on any platform)
that didn't include a primary key. If there is no pure business key,
make a surrogate key of an integer. Most DB modeling apps will want to
see a primary key when displaying relationships, and most FK
relationships will be to the primary key (can you even do non-PK
relationships, not sure).
At any rate, I'd be shocked if someone could come up with a good reason*
to define a table today w/out a primary key.
* "Good reason" does not include: Because that's how we do it, or
Because our old-timers wouldn't understand it. I mean a good real
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