Question:   How to update app with a new version with new SQLite tables?

We're updating an application in the App Store, and haven't yet found good information on how to deal with updates to the SQLite Schema and data that should be transferred between apps.
Anyone successfully done this?
Q1: Does the old DB files stay on the iPhone after update? Does the installer do a "diff" between them? In our case, we just extended tables, rather than changing them, in hope that we can successfully move the data for users gracefully.
Q2: If the installer does in fact wipe all the data and files on the app before install, is there a way to access the data before it updates, so the app can gracefully update the data?

to Templeton Peck:
Good Sir,
I would thoroughly appreciate you responding in a helpful manner rather than punishing my question with no regard to my question. Your harsh, quick, and false judgement was certainly not appreciated here. In regards to the macbook release: I was simply wondering IF there were releases of information that I had not heard of. I wasn't asking you to spill rumors of never released info.
Maybe you should read this material a little more carefully without hastily looking forward to ripping apart a wondering mac user.
But in regards to the SQL, I enjoy the following:
UPDATE table
SELECT........

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