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SQL and Relational Theory, 3e (Paperback, 3 Revised Edition)
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SQL and Relational Theory, 3e (Paperback, 3 Revised Edition)
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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 feature of this edition is a new appendix on NoSQL and
relational theory. Could you write an SQL query to find employees
who have worked at least once in every programming department in
the company? And be sure it's correct? Why is proper column naming
so important? Nulls in the database cause wrong answers. Why? What
you can do about it? How can image relations help you formulate
complex SQL queries? SQL supports "quantified comparisons," but
they're better avoided. Why? And how? Database theory and practice
have evolved considerably since Codd first defined the relational
model, back in 1969. This book draws on decades of experience to
present the most up to date treatment of the material available
anywhere. Anyone with a modest to advanced background in SQL can
benefit from the insights it contains. The book is product
independent.
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