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Learning PostgreSQL

You're reading from Learning PostgreSQL

Product type Book

Published in Nov 2015

Publisher Packt

ISBN-13 9781783989188

Pages 464 pages

Edition 1st Edition

Languages

Concepts

Database Programming

Table of Contents (21) Chapters

Learning PostgreSQL

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

1. Relational Databases

2. PostgreSQL in Action

3. PostgreSQL Basic Building Blocks

4. PostgreSQL Advanced Building Blocks

5. SQL Language

6. Advanced Query Writing

7. Server-Side Programming with PL/pgSQL

8. PostgreSQL Security

9. The PostgreSQL System Catalog and System Administration Functions

10. Optimizing Database Performance

11. Beyond Conventional Data types

12. Testing

13. PostgreSQL JDBC

14. PostgreSQL and Hibernate

Index

Getting the database cluster and client tools version

The PostgreSQL version allows the developer to know the supported features and helps them write compatible SQL queries for different versions. For example, the process ID attribute name in the pg_stat_activity view in PostgreSQL versions older than 9.2 is procpid; in PostgreSQL version 9.2, this attribute name is pid.

Getting ready

Getting the database and build version right is important because it allows the developer to know the supported features and compatibility between client tools and the backend version.

How to do it…

The version() function, as shown in the following query, shows the version information as well as build system:

car_portal=# SELECT version ();
                           version
-------------------------------------------------------------
 PostgreSQL 9.4.1, compiled by Visual C++ build 1800, 64-bit
(1  row)

There's more…

It is also important to check the client tools' version, whether it is pg_restore, pg_dumpall or...

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