How does the Entity Framework determine whether to use the multiplicity of "one" or "zero or one" for relationships?

Question

I programmatically create an edmx file as part of the code generation process, and I would like to know how the designer decides to use “1” or “0..1” for relationships when you “update the model from the database”. Any understanding of this? Thanks

Edit:

Well, I think it uses "0..1" when the "many" side is a null foreign key and "1" if it is not NULL. Can anyone confirm this?

Answer 1

, "0..1" "1" , "" .

, ( 1 1 ), 1 () 0..1 (Child).

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Answer 2

. EF , .