Book Image

PostgreSQL Development Essentials

By : Manpreet Kaur, Baji Shaik
Book Image

PostgreSQL Development Essentials

By: Manpreet Kaur, Baji Shaik

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
About the Authors
About the Reviewers

Introduction to arrays

PostgreSQL supports columns to defined as an  array. This array is of a variable length and can be defined as a one-dimensional or multidimensional array. You can create an array of any datatype, such as text, integer, or composite type, by appending [] at the end of the type. For example, you can declare an array of an integer type by using int[] or character data by using text[]. This array support in PostgreSQL helps build aggregate functions using IN and ANY clauses. We will explore its use in a later section.

Array constructors

An array can be created with the help of an ARRAY keyword comprising the list of expressions enclosed in square brackets:

SELECT ARRAY[1,2,3] AS sample_array; 
------- --------- --- 

By default, the datatype of the preceding array will be an integer as it is the common datatype for all members of sample_array. You can explicitly override the array datatype to the other datatype by using the...