Use a CTE that returns the row ID and the result of the DateDiff, then join that to your existing result set? It may or may not be faster, so as always, test it to see.
YouTube on MSN
I mastered date functions in Excel!
Learn essential date functions in Excel from beginner to pro in this tutorial. You'll discover how to calculate the number of working days between two dates and convert project timelines from months ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results