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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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PostgreSQL default access privileges


By default, PostgreSQL users—also known as roles with the login option—can access the public schema. Additionally, note that the default PostgreSQL authentication policy allows users to access all databases from the localhost using peer authentication on a Linux system. Users can create database objects -tables, views, functions and so on- in the public schema of any database that they can access by default. Finally, the user can alter some settings regarding sessions such as work_mem.

The user cannot access other user objects in the public schema or create databases and schemas. However, the user can sniff data about the database objects by querying the system catalog. Unprivileged users can get information about other users, table structure, table owner, some table statistics, and so on.

The following example shows how the user test_user is able to get information about a table, which is owned by a postgres user; to simulate this situation, let's create...

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