[Zope] filtering columns in a tinytable

Hello all, I've been reading about TinyTables and have found that they can be filtered by row (ie. employees(name='Marvin'). However, there is one piece of information that I couldn't find. Is there any way to filter it by column right in the call to the tiny table. This would be useful in the event that I only wanted the columns name, address, phone to be returned but not age, for example. I realize that this could be accomplished via writing a method. This is not preferable, but I will settle for that if necessary. What would be the simplest way to write a method to do it? Thanks, ~Mark