Chronological Eventcount Per User

Hi,

is it possible to a add field to each event and add a value to this field, that shows the chronological count of the specific event per user? Let's call this field "eventserial".

So that the first event per user (the event per user with the earliest timestamp) has an eventserial of "1". The second event of the users lifecycle has an eventserial of "2", and so on.

Thanks in advance

Heinz