PART IDatabase Concepts

CHAPTER 1Relational DatabaseManagement Systems

Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain [where] he is going. Practice must always be founded on sound theory.

The Discourse on Painting by Leonardo da Vinci

When I was a junior programmer, quite early in my career, my friends and I were assigned to work on a big software development project for which we would have to use unfamiliar technologies, though we were promised that training would be provided before the project started. All we knew in advance was that the operating system was something called VAX/VMS; we did not know which programming language or database ...

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