I'm not sure I understand what you mean about pointers though.
I'm talking about the practice, widespread in MySQL world, of all tables having a primary key of auto-increment integer.
There's nothing wrong, per se, with the example in the document as both Customer and Order are cases where an auto-integer is an appropriate primary key.
But I do think the reader could easily get the wrong idea, since the example consists of only those 2 tables.
Edit: Not that there's anything wrong with the practice. Just that your database is no longer a relational database. Knowing that fact and understanding why is, I think, a useful and educational thing for a student to understand.
I'm talking about the practice, widespread in MySQL world, of all tables having a primary key of auto-increment integer.
There's nothing wrong, per se, with the example in the document as both Customer and Order are cases where an auto-integer is an appropriate primary key.
But I do think the reader could easily get the wrong idea, since the example consists of only those 2 tables.
Edit: Not that there's anything wrong with the practice. Just that your database is no longer a relational database. Knowing that fact and understanding why is, I think, a useful and educational thing for a student to understand.