How to handle an OR condition in a view

Hi... I've Googled the heck out of this as well as asked around in IRC and can't find a good way to do it. I need to be able to have an OR condition in my view. For example, the where clause basically needs to say where field_date = OR field_no_expiration = 1. I've seen the views hooks and am assuming that I'll need to use one of those, but have no idea how to proceed. Thanks for any pointers!