Here is something handy:
Announcing O'Reilly Code Search, where you can enter search terms to find relevant sample code from nearly 700 O'Reilly books. The database currently contains over 123,000 individual examples, comprises 2.6 million lines of code, all edited and ready to use.
it's pretty neat, all the source code from all the O'Reilly books is searchable online
So to Search for the term SELECT in category SQL you would enter "cat:sql select" and this would return these results http://labs.oreilly.com/search.xqy?t=code&q=cat%3Asql+select
For C# you would do "cat:csharp select" and just SQL Server instead of SQL would be "cat:sql server select"
Let me know what you think