Of Cods original set of eight operators, union, difference, product, restrict, and project can be considered as

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Of Cod’s original set of eight operators, union, difference, product, restrict, and project can be considered as primitives. Give definitions of natural join, intersect, and (harder) divide in terms of those primitives.
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Modern Control Systems

ISBN: 978-0136024583

12th edition

Authors: Richard C. Dorf, Robert H. Bishop

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