Book Image

Learning PostgreSQL 10 - Second Edition

Book Image

Learning PostgreSQL 10 - Second Edition

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 (23 chapters)
Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Changing the data in the database


Data can be inserted into database tables, updated or deleted from the database. Respectively, statements are used for this: INSERT, UPDATE, and DELETE.

INSERT statement

The INSERT statement is used to insert new data into tables in the database. The records are always inserted into only one table.

The INSERT statement has the following syntax:

INSERT INTO <table_name> [(<field_list>)]
{VALUES (<expression_list>)[,...]}|{DEFAULT VALUES}|<SELECT query>;

The name of the table into which the records are inserted is specified after the INSERT INTO keywords. There are two options to use the INSERT statement, which has a different syntax: to insert one or several individual records or to insert the whole dataset of many records.

To insert one or several records, the VALUES clause is used. The list of the values to insert is specified after the VALUES keyword. Items of the list correspond to the fields of the table according to their order. If...