Given the following relations S and U, use ordered pair notation to express the relation U o S. b S с a b U US={Ex: (a, b), (b, c) Hint: Start with a pair of vertices such as (a, b). If there exists some intermediate vertex that a can reach through one arrow in S and that intermediate vertex can reach b through one arrow in U, then (a, b) is in U o S. Otherwise, (a, b) is not in U o S.
Given the following relations S and U, use ordered pair notation to express the relation U o S. b S с a b U US={Ex: (a, b), (b, c) Hint: Start with a pair of vertices such as (a, b). If there exists some intermediate vertex that a can reach through one arrow in S and that intermediate vertex can reach b through one arrow in U, then (a, b) is in U o S. Otherwise, (a, b) is not in U o S.
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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