1. A method for selectively determining privacy guarantees, comprising: specifying at least one first class of data in a database, said database comprising data corresponding to said first class of data, and said database further comprising additional data; calculating a first diameter for said first class of data; calculating a first noise distribution at least in part using said first diameter; performing a query over said first class of data and said additional data; adding a noise value selected from said first noise distribution to an output of said query.