But you're assuming that an identity column is available and that it has no gaps.
You're assuming as well that the data is being inserted to the table in the correct order.
That's why I used the ROW_NUMBER().
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2