Any good spatial database tutorials out there? [closed]

Question

I was looking to explore the spatial capabilities of PostGIS or SQL Server 2008. Maybe Oracle as well.

I was wondering if there are any good tutorials out there exploring the spatial capabilities of these database in particular or of this type of capability in general.

Does anyone know of any? Book recommendations would work as well.

Answer 1

I wrote a little blogpost about SQL Server geography data type here: SQL Server 2008 Proximity Search With The Geography Data Type

Answer 2

This isn't a tutorial, bit it's a good comparison of the various offerings, to see how they stack up against one another: Spatial Database Cross Compare