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Learning PostgreSQL 10

Learning PostgreSQL 10 - Second Edition

By : Juba, Volkov
2.3 (6)
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Learning PostgreSQL 10

Learning PostgreSQL 10

2.3 (6)
By: Juba, Volkov

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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The PostgreSQL PL/pgSQL control statements


The PostgreSQL control structure is an essential part of the PL/pgSQL language; it enables developers to code very complex business logic inside PostgreSQL.

Declaration statements

The general syntax of a variable declaration is as follows:

name [ CONSTANT ] type [ COLLATE collation_name ] [ NOT NULL ] [ { DEFAULT | := | = } expression ];
  • name: The name should follow the naming rules discussed in Chapter 03, PostgreSQL Basic Building Blocks. For example, the name should not start with an integer.
  • CONSTANT: The variable cannot be assigned another value after the initialization. This is useful in defining constant variables such as PI.
  • type: The type of variable can be simple, such as an integer, user-defined data type, pseudo type, record, and so on. Since a type is created implicitly when creating a table, one can use this type to declare a variable.

Note

In PostgreSQL, the following two declarations are equivalent; however, the second declaration is more...

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