Looking for a simple database...

Is there a simple database app on the Mac that would allow me to import some data from a CSV/Excel/Etc and then perform queries on it? For example I have a mailing list that I maintain with data from an online contact service. The service doesn't have sophisticated enough search tools for building my lists. So what I would like to do is download all the data and then do my own searches. An example might be importing data such as:
Company, Job Title
Best Company, Admin
Best Company, Supervisor
Beans Ltd, Admin
Beans Ltd, Admin
Gas Guzzlers, Admin
Gas Guzzlers, Supervisor
Prime Time, Admin
Prime Time, Admin

The perform a query like "show me all the companies that don't have a Supervisor". (I'm not looking for "regular speech" search capabilities, I'm just using it as the type of query I'm going to perform)

Thanks!