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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put that theory into practice. In this book, Chris Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it to your use of SQL.

This third edition has been revised, extended, and improved throughout. Topics whose treatment has been expanded include data types and domains, table comparisons, image relations, aggregate operators and summarization, view updating, and subqueries. A special...

Date on Database: Writings 2000-2006 captures the thoughts of widely known and respected relational database pioneer C. J. Date. Known for his tenacious defense of relational theory in its purest form, Date tackles many topics that are important to database professionals, including the difference between model and implementation, data integrity, data redundancy, deviations in SQL from the relational model, and much more.

Date clearly and patiently explains where many of today's products and practices go wrong, and illustrates some...

Der fünfzehnjährige Daichi Tamanashi ist ein unscheinbarer Junge, der von seinen Mitschülern wie Luft behandelt wird. Im Internet, dem einzigen Ort, an dem er sein wahres Ich zeigen kann, findet Daichi einen besonderen Freund. Aus dem anonymen Austausch von privaten Nachrichten entsteht eine Liebesgeschichte der besonderen Art...

And speaking of the smart phone in your hands, if you have wanted to "get in" on the mobile apps ecosystem and build...

Many facets of the theory of general relativity have been uncovered over the past century and advances in technology enable more sophisticated tests of the theory. Research efforts have correspondingly shifted in different directions. This book provides a broad perspective on these developments at a level understandable to beginning researchers. It can also be used as supplementary reading in a graduate-level course on general relativity. The book emphasizes advanced topics and experiments.