PostgreSQL Development Essentials

PostgreSQL Development Essentials

By : Baji Shaik

Buy this Book

PostgreSQL Development Essentials

By: Baji Shaik

Buy this Book

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

PostgreSQL Development Essentials

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Advanced SQL

Creating views

Materialized views

Creating cursors

Using the GROUP BY clause

Using the HAVING clause

Using the UPDATE operation clauses

Using the LIMIT clause

Using subqueries

Subqueries that return multiple rows

Using the Union join

Using the Self join

Using the Outer join

Summary

Data Manipulation

Conversion between datatypes

Introduction to arrays

Summary

Triggers

Introduction to triggers

Creating a trigger function

Summary

Understanding Database Design Concepts

Basic design rules

Normalization

Anomalies in DBMS

Summary

Transactions and Locking

Defining transactions

Summary

Indexes and Constraints

Introduction to indexes and constraints

Clustering on an index

Exclusion constraints

Summary

Table Partitioning

Table partitioning

Summary

Query Tuning and Optimization

Query tuning

Optimizer settings for cached data

Multiple ways to implement a query

Bad query performance with stale statistics

Explain Plan

Query operators

Summary

PostgreSQL Extensions and Large Object Support

Creating an extension

Using binary large objects

Summary

Using PHP in PostgreSQL

Postgres with PHP

PHP-to-PostgreSQL connections

Dealing with DDLs

DML operations

Data retrieval

Helper functions to deal with data fetching

Summary

Using Java in PostgreSQL

Making database connections to PostgreSQL using Java

Using prepared statements

Connection properties

Summary

Customer Reviews

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Exclusion constraints

This constraint specifies that if any two rows are compared on the specified column(s) or expression(s) using the specified operator(s), at least one of these operator comparisons will return false or null. Let's look at this example:

CREATE EXTENSION btree_gist;
CREATE TABLE example(
name varchar,
age integer,
EXCLUDE USING gist
(AGE WITH <>));

In the preceding example, we are enforcing that age has to match an already existing one. What happens if you try to insert a different age? Let's look at this example:

postgres=# INSERT INTO example VALUES ('scott', '26');
INSERT 0 1
postgres=# INSERT INTO example VALUES ('scott', '27');
ERROR:  conflicting key value violates exclusion constraint  "example_age_excl"
DETAIL:  Key (age)=(27) conflicts with existing key (age)=(26).

It throws an ERROR that the exclusion constraint is violated. Adding an exclusion constraint will automatically create an index of the type specified in the constraint declaration.

PostgreSQL Development Essentials

By : Baji Shaik

PostgreSQL Development Essentials

By: Baji Shaik

Overview of this book

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PostgreSQL Development Essentials

Exclusion constraints