The query's nodes are defined by code. The query graph defines a specific collection of nodes and associated properties. For example, this description states that the query network must contain six nodes (1–6), with two square nodes (2 and 6) and two hexagon nodes (1 and 5). The last two nodes (3 and 4) can be of any form.

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
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The query's nodes are defined by code. The query graph defines a specific collection of nodes and associated properties. For example, this description states that the query network must contain six nodes (1–6), with two square nodes (2 and 6) and two hexagon nodes (1 and 5). The last two nodes (3 and 4) can be of any form.

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