Database developers often disagree about whether it’s better to use naturally occurring data or meaningless values as a table’s primary key. Technically, there is no right or wrong to this ...

A primary key is a field used to uniquely identify every record in the database. Sometime primary keys are obvious, for example a car license plate could be used to uniquely identify cars.

Apple requires that you use at least two security keys if you ... you’ll have a backup in the event that you lose your primary key and won’t be locked out of your account.