That would completely depend on how the table as defined.
If the field that is defined as the primary key is set t autoincrement, than it should. But if its not set to autoincrement then it won't.
If you get an error, it be nice if you posted it so we may take a look.
----------------------------------
Phil AKA Vacunita
----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.