On Apr 2, 2008, at 12:02 PM, Art Isbell wrote:
I think that this agrees with relational database theory; i.e., all one-to-one relationships must be 1:1, not 1:0. A 1:0 relationship is just a special case of a 1:many relationship.
It is definitely possible to have an optional to-one, just not one where the FK is also the PK.
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