Thank you for your reply. Here at this forum (RE: [nhusers] Re: Mapping one-to-one entities - https://groups.google.com/forum/#!searchin/nhusers/one-to-one$20one-to-many/nhusers/jp8Zd8djdh8/hd7JCB-LIVAJ) I read: > Strictly speaking, optional items are one-to-many associations. The > semantic of an one-to-one association is 1:1 not 1:0,1. So I assume > one-to-one’s are not advised because it’s better to put the data in one > table to avoid the hassle with aligning id’s and the join in each access. > and because DbLogin is really optional, i abandoned the <one-to-one> way.
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