What is a Boolean expression?

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
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What is a Boolean expression?

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A Boolean expression is an expression which is used in programming languages. This expression results in a Boolean value when evaluated. A Boolean value could be either true or false (1 or 0).

These expressions have three parts. It has the two items which are compared and a comparison operator separating the items. More Boolean expressions could be created by combining other multiple Boolean expressions with the OR and AND logical operators. Each expression which is joined by OR or AND should be a whole Boolean expression itself, even when it specifies the same variable several times.

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