Hmmm - not quite sure what you're after. Do you have a 'person' table containing an e-mail field and want to maintain a separate table which contains just e-mail address (and, presumably, a foreign key back to the main 'person' table)?

So do you therefore want to migrate your e-mail addresses away from your 'person' table? Or do you want to store them in two places for some reason?

Please provide more detail on what you are trying to do.

Regards

Phil