BostonGIS is a testbed for GIS and Web Mapping solutions utilizing open source, freely available and/or open gis technologies. We will be using mostly Boston, Massachusetts data to provide mapping and spatial database examples.
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pgRouting: A Practical Guide direct from LocatePress
PostGIS in Action
check out book and download the first chapter and SQL Primer for free.
PostgreSQL: Up and Running 3rd Edition
This is an article by Nicklas Aven explaining some of the unpredicatabliltiy of the Filter function in SQL Server 2008 and how it behaves slighly differently in the SELECT part than it does in the WHERE.