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loginThis book is a companion to my An Introduction to Relational Database Theory (reference [7]) and is intended to be read in parallel with that text, hereinafter referred to as “the theory book”. As I noted in the preface of that book, a university course on relational databases is typically divided into a theory component and an “industrial” component requiring the student to learn the basics of SQL. In that preface I also mention that in my own teaching I encourage students to “compare and contrast SQL with what they have learned in the theory part”. This book is my own attempt to compare and contrast it, piece by piece, with what I have taught in the theory book.