Answered: Consider relations R(A, B, C), S(C, D,…

Consider relations R(A, B, C), S(C, D, E) and T(E, F, G). Find a re- lational expression which (1) is equivalent to IIA,F(OB

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Make sure to show the correct work and solution:

Consider relations R(A, B, C), S(C, D, E) and T(E, F, G). Find a re-
lational expression which (1) is equivalent to IIA,F(OB<D ^ G=1(R = S ▷ T)) and (2) applies
selections and projections as early as possible to reduce the size of intermediate relations produced
by operators. If both a selection and a projection can be applied to a relation, apply the selection
earlier than the projection. Also, make sure to apply each projection on the smallest number of
attributes (to reduce the amount of data to process).

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