this post was submitted on 20 Jun 2024
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I don't think that holds true in all scenarios. You need to use a key that has some guarantees. In many systems you will use data you don't control, like email addresses, IBANs, ISBNs, passport IDs and many more. You have zero control over those keys, but because each comes with certain guarantees, they might be suitable as a foreign key in your context.
People regularly change email addresses. Listing that as an example is a particularly bad example in my opinion.
@Kissaki @state_electrician Well, I use the same self hosted Email address since the late 80‘s. I do not consider that changing it regularly.
Ignoring secondary email addresses, what was my primary [onlineaccount] E-Mail address has changed four times.