Book Image

Learning PostgreSQL 10 - Second Edition

Book Image

Learning PostgreSQL 10 - Second Edition

Overview of this book

PostgreSQL is one of the most popular open source databases in the world, supporting the most advanced features included in SQL standards. This book will familiarize you with the latest features released in PostgreSQL 10. We’ll start with a thorough introduction to PostgreSQL and the new features introduced in PostgreSQL 10. We’ll cover the Data Definition Language (DDL) with an emphasis on PostgreSQL, and the common DDL commands supported by ANSI SQL. You’ll learn to create tables, define integrity constraints, build indexes, and set up views and other schema objects. Moving on, we’ll cover the concepts of Data Manipulation Language (DML) and PostgreSQL server-side programming capabilities using PL/pgSQL. We’ll also explore the NoSQL capabilities of PostgreSQL and connect to your PostgreSQL database to manipulate data objects. By the end of this book, you’ll have a thorough understanding of the basics of PostgreSQL 10 and will have the necessary skills to build efficient database solutions.
Table of Contents (23 chapters)
Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

The JSON data structure


JSON is a universal data structure that is human and machine-readable. JSON is supported by almost all modern programming languages, embraced as a data interchange format and heavily used in RESTful web services.

JSON and XML

XML and JSON are both used to define the data structure of exchanged documents. JSON grammar is simpler than that of XML, and JSON documents are more compact. JSON is easier to read and write. On the other hand, XML can have a defined data structure enforced by the XML schema definition (XSD) schema. Both JSON and XML have different usages as exchange formats; based on personal experience, JSON is often used within organizations themselves or with web services and mobile applications due to its simplicity, while XML is used to define highly structured documents and formats to guarantee interoperability with data exchange between different organizations. For example, several Open Geospatial Consortium (OGC) standards, such as web map services, use...