This book does a great job of explaining data modeling, including how it corresponds to tables in a database. The book is well-written and very organized, and the examples do a good job of illustrating the concepts. It's also mercifully short compared to other options.
It's appropriate for database beginners, and for experiences developers who are getting into database design for the first time. There's a section on how this all relates to OOP, with no focus on a specific language.
The examples apply to any database systems that support standard SQL including Access and MySQL. Note that the book does not cover Access and MySQL directly -- you'll need different resources for that. For MySQL, the tutorials on the MySQL site itself are a surprisingly good place to start.
This book tells you how to think about your database *before* you begin to develop it, which can be critical if you're designing anything even slightly complicated.
I'm developing a Ruby on Rails web app, and this book really helped me think through some issues that I had not considered until now.