It's less about literature, and more about experience. Over the years just about every natural key I've seen ends up being either not-universal (-everyone- has

It's less about literature, and more about experience. Over the years just about every natural key I've seen ends up being either not-universal (-everyone- has a phone number right? Even that new-born baby?) Or not unique (phone numbers can be shared) or mutable (like people's names changing). It's just so much easier to add a column and use a surrogate key. I prefer uuids because they are unique And immutable - properties I really appreciate in primary keys.