Let the following relation schemas be given: R = (A, B, C) S = (D, E, F)

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Let the following relation schemas be given:

R = (A, B, C)

S = (D, E, F) Let relations r(R) ands(S) be given. Give expressions in QBE, and Data log equivalent to each of the following queries:

a. IIA(r)

b. σB =17 (r)

c. r × sd. 

d. IIA,F (σC =D(r × s))

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Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

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