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Hello,

I don't understand yor multiplicity in EF Core for one to one relations. For me it looks like they are on the wrong end in the designer. We are using ED 6.12.1354 with MS SQL Database.

We have two Tables 'WithTwoKeyFields' and 'RequiredOneToOne' table.
WithTwoKeyFields table is the principial of the relation and has just two columns as PK:


'RequiredOneToOne' table has its own primary key and the two not nullable FK columns referencing to the PK columns of the WithTwoKeyFields table:


So, a WithTwoKeyField row can have 0..1 RequiredOneToOne rows referenced.
A RequiredOneToOne always needs/has 1 WithTwoKeyField referenced.

So UML Multiplicity is WithTwoKeyField 1..1 -------> 0..1 RequiredOneToOne.

But the Designer shows it the other way around! This seems wrong to me:


Can you explain this?

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