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Learning PostgreSQL 10

Learning PostgreSQL 10 - Second Edition

By : Salahaldin Juba, Isabel Maria Duarte Rosa, Andrey Volkov, Sheldon Strauch
2.3 (6)
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Learning PostgreSQL 10

Learning PostgreSQL 10

2.3 (6)
By: Salahaldin Juba, Isabel Maria Duarte Rosa, Andrey Volkov, Sheldon Strauch

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 (17 chapters)
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Common table expressions


Although SQL is a declarative language, it provides a way of implementing the logic of sequential execution of code or of reusing code.

Common table expressions (CTE) is a feature that makes it possible to define a subquery once, give it a name, and then use it at several places in the main query.

The simplified syntax diagram for CTE is as follows:

WITH <subquery name> AS (<subquery code>) [, ...]
SELECT <Select list> FROM <subquery name>;

In the preceding syntax diagram, subquery code is a query whose results will be used later in the primary query as if it was a real table. The subquery in parentheses after the AS keyword is a common table expression. It can also be called a substatement or an auxiliary statement. The query after the WITH block is the primary or main query. The whole statement itself is called a WITH query.

It is possible to use not only the SELECT statements in a CTE, but also the INSERT, UPDATE, or DELETE statements. It is...

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