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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

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
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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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).
Transcribed Image Text: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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