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

Preface

What this book covers

What you need for this book

Free Chapter

1. 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

2. Data Manipulation

Conversion between datatypes

Introduction to arrays

Summary

3. Triggers

Introduction to triggers

Creating a trigger function

Summary

4. Understanding Database Design Concepts

Basic design rules

Normalization

Anomalies in DBMS

Summary

5. Transactions and Locking

Defining transactions

Summary

6. Indexes and Constraints

Introduction to indexes and constraints

Clustering on an index

Exclusion constraints

Summary

7. Table Partitioning

Table partitioning

Summary

8. 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

9. PostgreSQL Extensions and Large Object Support

Creating an extension

Using binary large objects

Summary

10. 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

11. Using Java in PostgreSQL

Making database connections to PostgreSQL using Java

Using prepared statements

Connection properties

Summary

Customer Reviews

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Multiple ways to implement a query

As we all know, a query can be implemented in several ways. But only one will be implemented among them:the one that takes the least cost when compared to the rest. For demonstration purposes, let's consider we have a payments table, which makes customer id entry along with the payment date when the customer clears his payment.

Now the general request from the management team is something like, "Get me the customers who've paid so far".

For this requirement, we can write queries like the following:

Approach 1: Joining tables

        CREATE TABLE payments (id integer, amount numeric, paydate  date);
        postgres=# EXPLAIN ANALYZE SELECT c.id FROM customers C, 
        payments P WHERE        
        c.id=p.id AND p.paydate<=now()::date;
                          QUERY PLAN
        ---------------------------------------------------------------                
        Hash Join  (cost=16236.00..36268.00 rows=412000 width=4)  (actual ...

PostgreSQL Development Essentials

By : Baji Shaik

PostgreSQL Development Essentials

By: Baji Shaik

Overview of this book

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PostgreSQL Development Essentials

Multiple ways to implement a query