> That experience ought to tell you have a reasonable chance of needing to be joined relationally at some point? Then the smart thing to do is to interpret that

> That experience ought to tell you have a reasonable chance of needing to be joined relationally at some point? Then the smart thing to do is to interpret that as a 1NF violation. The smart thing is to separate phone numbers into separate fields if you need to treat them separately. But I don't see what this has to do with 1NF? Something can be bad design without being a 1NF violation and vice versa.