Park Bborie Park & Corti Paolo Corti 
PostGIS Cookbook [EPUB ebook] 

An easy-to-use guide, full of hands-on recipes for manipulating spatial data in a Post GIS database. Each topic is explained and placed in context, and for the more inquisitive, there are more details of the concepts used. If you are a web developer or a software architect, especially in location-based companies, and want to expand the range of techniques you are using with Post GIS, then this book is for you. You should have some prior experience with Postgre SQL database and spatial concepts.