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Getting Started with the Graph Query Language (GQL)

You're reading from   Getting Started with the Graph Query Language (GQL) A complete guide to designing, querying, and managing graph databases with GQL

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Product type Paperback
Published in Aug 2025
Publisher Packt
ISBN-13 9781836204015
Length 392 pages
Edition 1st Edition
Languages
Concepts
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Authors (3):
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Ricky Sun Ricky Sun
Author Profile Icon Ricky Sun
Ricky Sun
Jason Zhang Jason Zhang
Author Profile Icon Jason Zhang
Jason Zhang
Yuri Simione Yuri Simione
Author Profile Icon Yuri Simione
Yuri Simione
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Toc

Table of Contents (17) Chapters Close

Preface 1. Evolution Towards Graph Databases 2. Key Concepts of GQL FREE CHAPTER 3. Getting Started with GQL 4. GQL Basics 5. Exploring Expressions and Operators 6. Working With GQL Functions 7. Delve into Advanced Clauses 8. Configuring Sessions 9. Graph Transactions 10. Conformance to the GQL Standard 11. Beyond GQL 12. A Case Study – Anti-Fraud 13. The Evolving Landscape of GQL 14. Glossary and Resources 15. Other Books You May Enjoy
16. Index

Using value expressions

A value expression specifies values in GQL. The GQL standard divides value expressions into boolean and common value expressions. Common value expressions include numeric, string, datetime, duration, list, record, path, and reference value expressions. Value expressions produce a value and can be used in most GQL statements and clauses.

Boolean value expressions

A Boolean value expression produces a truth value as a result. In the previous section, we covered comparison and boolean operators, commonly included in Boolean value expressions.

Here’s an example of a Boolean value expression:

GQL:
LET a = TRUE, b = FALSE RETURN a OR b

In this query, a OR b is a boolean expression that produces a truth value result. This expression uses Boolean operators.

Here’s another example:

GQL:
LET a = 1 RETURN a > 0

Here a > 0 is an expression using comparison operators. Its result is a truth value, so this expression is...

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