I even suggest it as a good way to learn about relational databases, in general. The only downside is if the reader is "spoiled" by a particular feature that's

I even suggest it as a good way to learn about relational databases, in general. The only downside is if the reader is "spoiled" by a particular feature that's documented as standard (such as to comply with one) and subsequently has to work with one that lacks it or implements it less completely.