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Asked: 2026-05-14T19:31:07+00:00

I’ve been playing around with Active Record a bit, and I have noticed that

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I’ve been playing around with Active Record a bit, and I have noticed that A.C./ORM always uses the following database model when creating a one-to-one relationship

Person

id | country_id | name | …

Country

id | tld | name | …

No I wondered, isn’t this a violiation of the third Normal Form? This clearly states “Every non-prime attribute is non-transitively dependent on every key of the table”. Well this country_id isn’t dependent of personid is it?

So is this wrong or am I just not getting the point?

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1 Answer

  1. Editorial Team

    A functional dependency, A => B, means that each distinct value of A can, by definition, only be associated with a single value of B. In other words, if you know A, then B is a given. In this case, a given personid can only be associated with one country_id, therefore personid => country_id.

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