Re: uniqueness constraint on an a foreign key
Re: uniqueness constraint on an a foreign key
- Subject: Re: uniqueness constraint on an a foreign key
- From: Florijan Stamenkovic <email@hidden>
- Date: Fri, 19 Sep 2008 15:34:38 -0400
On Sep 19, 2008, at 14:56, Chuck Hill wrote:
On Sep 19, 2008, at 11:52 AM, Florijan Stamenkovic wrote:
On Sep 19, 2008, at 13:26, Chuck Hill wrote:
If the relationship is mandatory, I'd use the PK.
As in propagate PK? That does not work in this case because there
can be A rows that do not have any related B rows.
Or did you mean something else?
Yes, that is what I was thinking of. If it is not really a to-
many, why not put the PK of B into A as a FK?
That would just reverse the situation into A <<-> B, no? What I need
to is an enforced A <-> B, and in that B -> A is mandatory, and A ->
B as optional.
F
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