I like this style better than SQL for Smarties. Celko tries to stick with the ANSI standard, which is fine, but I much to prefer to know how to get the most out of each platform.

Like here, http://explainextended.com/2009/09/, he covers adjacency list vs. nested sets on MySQL, Postgres, Oracle and SQL Server. Different platforms, different optimal solutions. The man knows his database internals.