[FX.php List] How do I display subsummarized data on my webpage?

[Laura Long]

Hi,  I have a query that returns a list of book titles.  Stored within
the database is a category that has been assigned to each title, how can
I make it display the Category name, then the books assigned to that
category, the next Category then, the books assigned to that one, etc.
The query is on a specific set of books, such as all books beginning
with "A".  

Thanks for any help offered :)

Laura