Question : autovalue t-sql sql server 2008

I've got a table with many fields.
One of them is the primary key and a second is a unique index named "LaufNr".
I want to make a insert select statement on this table.
The problem I have is that I have to set for each new dataset a unique "LaufNr" and I can't use auto increment. So I have to do it with a own function. Which methodes can I use?

Answer : autovalue t-sql sql server 2008

You can do it this way..

INSERT into ur_table
SELECT other_columns, row_number() over ( order by some_column) LaufNr
FROM ur_table

>> I have to set for each new dataset a unique "LaufNr" and I can't use auto increment

Kindly explain more on this..