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are non-unique inversion attributes supported in SQLDBM?
A non-unique 'inversion' attribute acts like an alternate key (but is non-unique). This can also be migrated to child objects (much like a normal primary key. This is something that ERWin supports. Does SQLDBM support this natively? I don't see an option for it (having said that, it is still manually doable).
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We do offer Virtual Relationships, which might get you what you're looking for: https://intercom.help/SqlDBMhelpcenter/en/articles/4819855-relationships