Exercise 4:R1 = {(a, b) E R² | a > b}, the “greater than" relation,R2 = {(a, b) E R² | a > b}, the “greater than or equal to" relation,R3 = {(a, b) E R² | a < b}, the "less than" relation,R4 = {(a, b) E R² | a

Notations used X U Y It implies that all values either exist in X or in Y. It is known as UNION…

Answered: a) R1 U R3. b) R1 – R2.

Engineering

Computer Science

a) R1 U R3. b) R1 – R2.

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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Concept explainers

Concept of memory addresses in pointers

The concept of pointers in high-level languages was introduced in C programming. Pointers are simply the variables that are used to store memory addresses of another variable. These special variables are generally used in the languages such as C Programming and C++ Programming, where it allows the programmer to work more deeply with memory and its addresses.

Question

Exercise 4:
R1 = {(a, b) E R² | a > b}, the “greater than" relation,
R2 = {(a, b) E R² | a > b}, the “greater than or equal to" relation,
R3 = {(a, b) E R² | a < b}, the "less than" relation,
R4 = {(a, b) E R² | a <b}, the “less than or equal to" relation,
R5 = {(a, b) E R² | a = b}, the “equal to" relation,
R6 = {(a, b) E R² | a ± b}, the "unequal to" relation.
a) R1 U R3.
b) R1 – R2.

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