Relational Algebra Primer

Bmg, the Ruby implementation of relational algebra, has been around for 10 years. We're making and effort to create comprehensive documentation, and as part of that effort we put together a primer on relational algebra. It aims to be a bit less theory-heavy and more hands-on than the typical introductory material you find online (which tends to be university course materials). Relational algebra isn't just interesting background theory, but was created for programmers and has very tangible benefits.

Any questions, suggestions, comments or criticisms would be appreciated!

Great stuff :-)

Most introductions to relational algebra lack effective tooling, while SQL is closer to a calculus than an algebra

I hope university teachers will see here an opportunity for practical exercises with their students !