Book Image

Learn PostgreSQL

By : Luca Ferrari, Enrico Pirozzi
Book Image

Learn PostgreSQL

By: Luca Ferrari, Enrico Pirozzi

Overview of this book

PostgreSQL is one of the fastest-growing open source object-relational database management systems (DBMS) in the world. As well as being easy to use, it’s scalable and highly efficient. In this book, you’ll explore PostgreSQL 12 and 13 and learn how to build database solutions using it. Complete with hands-on tutorials, this guide will teach you how to achieve the right database design required for a reliable environment. You'll learn how to install and configure a PostgreSQL server and even manage users and connections. The book then progresses to key concepts of relational databases, before taking you through the Data Definition Language (DDL) and commonly used DDL commands. To build on your skills, you’ll understand how to interact with the live cluster, create database objects, and use tools to connect to the live cluster. You’ll then get to grips with creating tables, building indexes, and designing your database schema. Later, you'll explore the Data Manipulation Language (DML) and server-side programming capabilities of PostgreSQL using PL/pgSQL, before learning how to monitor, test, and troubleshoot your database application to ensure high-performance and reliability. By the end of this book, you'll be well-versed with the Postgres database and be able to set up your own PostgreSQL instance and use it to build robust solutions.
Table of Contents (27 chapters)
Section 1: Getting Started
Section 2: Interacting with the Database
Section 3: Administering the Cluster
Section 4: Replication
Section 5: The PostegreSQL Ecosystem

Exploring data types

As users, we have already had the opportunity to experience the power and versatility of server-side functions – for example, in Chapter 5, Advanced Statements, we used a query similar to the following:

forumdb=# select * from categories where upper(title) like 'A%';
pk | title | description
10 | apple | fruits
14 | apricot | fruits
(2 rows)

In this piece of code, the upper function is a server-side function; this function turns all the characters of a string into uppercase. In this chapter, we will acquire the knowledge to be able to write functions such as the upper functions that we called in the preceding query.

In this section, we'll talk about data types. We will briefly mention the standard types managed by PostgreSQL and how to create new ones.

The concept of extensibility

What is extensibility? Extensibility is PostgreSQL's ability to extend its functionality and its data types. Extensibility is...