An Introduction to Database Systems

An Introduction to Database Systems (1975) by C. J. Date. Addison-Wesley. ISBN: 0201144522 . Condition: Good. Sold by Crappy Old Books , where even the paperbacks have strong opinions about normalisation. This is not just a textbook. This is a foundational artefact from the era when ?database? still sounded faintly like science fiction and ?computer? did not mean something you carried in your pocket while arguing with strangers. In 1975, data was serious business: it lived in rooms, it had operators, and it demanded respect. C. J. Date did not merely explain database systems ? he laid down the law, calmly, firmly, and with the sort of precision that makes you feel guilty for ever having stored anything as final_final_v3_reallyfinal.csv . If you?ve ever wondered why some people speak of data integrity the way others speak of morality, this is where that religion gets its scriptures. Inside, you?ll find the great themes: the idea that information should be structured, relationships should be explicit, and chaos should be kept firmly outside the schema. It?s the book that teaches you (sometimes gently, sometimes with the implied threat of professional shame) that ?it works? is not the same as ?it?s correct,? and that a database is not a magical bucket you throw things into until a report appears. There is a particular, almost touching seriousness to mid-70s computing writing. The tone is methodical, the ambition is grand, and the underlying belief is that if we can just formalise things properly ? names, keys, relationships, rules ? then the world will become more rational. Which, to be fair, is exactly what database people still believe, right up until someone insists on putting multiple values in one field ?for convenience.? Expect talk of models, structure, constraints, and the kind of principled thinking that makes modern ?move fast and break things? sound like a toddler with a hammer. You don?t ?hack? your way through this. You learn . You build. You respect the concept of dependency the way Victorian engineers respected load-bearing beams. And yes, it?s delightfully ironic reading now, in a world where we can spin up cloud databases in minutes and still manage to lose half the data because someone ran DELETE without a WHERE . This book is the sober ancestor, standing in the doorway with arms folded, quietly judging your casual relationship with backups. Condition: Good ? which is perfect. A copy of C. J. Date shouldn?t be pristine. It should look like it?s been used: consulted in late-night debugging sessions, argued with, admired, perhaps even sworn at. ?Good? suggests it has served someone, which is about the highest compliment a database book can receive. Ideal for: vintage computing collectors and historians of the early data age, working developers who enjoy seeing where the hard rules came from, anyone who wants to understand why relational thinking became the backbone of business computing, and people who find the phrase ?data integrity? strangely soothing. So here it is: a heavyweight classic from the time when databases were becoming civilisation?s filing cabinet, and the people building them were trying very hard to save humanity from itself ? one carefully defined relation at a time. Crappy Old Books ? supplying timeless wisdom, structured properly, with no duplicates and a primary key you can trust.…