We welcome this contribution to the database literature. It is another book on the theory and practice of relational databases, but this one is interestingly different. The bulk of the book is devoted to a treatment of the theory. The treatment is not only rigorous and mathematical, but also rather more approachable than some other texts of this kind. The authors clearly recognize, as we do, the importance of logic and mathematics if database study is to be taken seriously. They have done a good job of describing a certain formalism developed by their former teachers, Bert de Brock and Frans Remmen. This formalism includes some ideas that will ...
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