In this chapter, we looked at ways in which we can extend the functionality of PostgreSQL queries through triggers. You learned that PostgreSQL triggers can use trigger functions, which enhance the functionality of triggers. As discussed in this chapter, triggers can be used as an alternative method to implement referential integrity constraints. By using triggers, business rules and transactions are easy to store in the database and can be used consistently even if there are future updates to the database. When a change happens in a database, a trigger can adjust the change to the entire database using the INSERT
, UPDATE
, or DELETE
statements. In the next chapter, we will talk about some important aspects of database design, what makes a good database, and database design practices.

PostgreSQL Development Essentials
By :

PostgreSQL Development Essentials
By:
Overview of this book
PostgreSQL is the most advanced open source database in the world. It is easy to install, configure, and maintain by following the documentation; however, it’s difficult to develop applications using programming languages and design databases accordingly. This book is what you need to get the most out of PostgreSQL
You will begin with advanced SQL topics such as views, materialized views, and cursors, and learn about performing data type conversions. You will then perform trigger operations and use trigger functions in PostgreSQL. Next we walk through data modeling, normalization concepts, and the effect of transactions and locking on the database.
The next half of the book covers the types of indexes, constrains, and the concepts of table partitioning, as well as the different mechanisms and approaches available to write efficient queries or code. Later, we explore PostgreSQL Extensions and Large Object Support in PostgreSQL. Finally, you will perform database operations in PostgreSQL using PHP and Java. By the end of this book, you will have mastered all the aspects of PostgreSQL development. You will be able to build efficient enterprise-grade applications with PostgreSQL by making use of these concepts
Table of Contents (17 chapters)
PostgreSQL Development Essentials
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Advanced SQL
Data Manipulation
Understanding Database Design Concepts
Transactions and Locking
Indexes and Constraints
Table Partitioning
Query Tuning and Optimization
PostgreSQL Extensions and Large Object Support
Using PHP in PostgreSQL
Customer Reviews