Book Image

Learning PostgreSQL 11 - Third Edition

By : Salahaldin Juba, Andrey Volkov
Book Image

Learning PostgreSQL 11 - Third Edition

By: Salahaldin Juba, Andrey Volkov

Overview of this book

PostgreSQL is one of the most popular open source database management systems in the world, and it supports advanced features included in SQL standards. This book will familiarize you with the latest features in PostgreSQL 11, and get you up and running with building efficient PostgreSQL database solutions from scratch. Learning PostgreSQL, 11 begins by covering the concepts of relational databases and their core principles. You’ll explore the Data Definition Language (DDL) and commonly used DDL commands supported by ANSI SQL. You’ll also learn how to create tables, define integrity constraints, build indexes, and set up views and other schema objects. As you advance, you’ll come to understand Data Manipulation Language (DML) and server-side programming capabilities using PL/pgSQL, giving you a robust background to develop, tune, test, and troubleshoot your database application. The book will guide you in exploring NoSQL capabilities and connecting to your database to manipulate data objects. You’ll get to grips with using data warehousing in analytical solutions and reports, and scaling the database for high availability and performance. By the end of this book, you’ll have gained a thorough understanding of PostgreSQL 11 and developed the necessary skills to build efficient database solutions.
Table of Contents (18 chapters)

Transactions

A transaction is a set of operations that might include updating, deleting, inserting, and retrieving data. These operations are often embedded in a higher-level language, or can be explicitly wrapped in a transaction block using BEGIN and END statements. A transaction is successfully executed if all the operations with in the transaction are executed successfully. If an operation in a transaction fails, the effect of the partially executed operation on the transaction can be undone.

To control the beginning and end of a transaction explicitly, the BEGIN statement can be used to denote the start of the transaction, and the statements END or COMMIT to denote the end of the transaction. The following example shows how to explicitly execute an SQL statement in a transaction:

BEGIN; 
CREATE TABLE employee (id serial primary key, name text, salary numeric);
COMMIT;

One use...