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
Basic Statements

In this chapter, we will discuss basic SQL commands for PostgreSQL; these are Data Definition Language (DDL) commands and Data Manipulation Language (DML) commands. In basic terms, DDL commands are used to manage databases and tables, and DML commands are used to insert, delete, update, and select data inside databases. In this chapter, we will also discuss the psql environment, which refers to the interactive terminal for working with PostgreSQL. psql can be described as PostgreSQL's shell environment; it is the gate we have to go through in order to start writing commands natively in PostgreSQL. We have to remember that psql is always present in any PostgreSQL installation we work with. psql is a powerful environment in which to manage our data and our databases.

Basic statements and psql are therefore the foundations on which we will build our knowledge...