Very simple Zend_Db_Table question

[Dyntai]

I know this sounds rediculously easy but there is simply no documentation about this subject findable on google.I'd like to to select two columns from the database. I made a Zend_Db_Table object and point it to my table.Now I like to select two columns: customerId and name.What should I do to select just those two columns and not the whole table?Thanks in advance, I'll bake you a cake or clean your room.