Is there an aggregate function for finding the difference?
Reply from Richard Rost:
No. You can't really take the difference of a group of numbers, because if I give you 4,8,1 how do you know which one is first? 4-8-1 is different from 1-8-4. If you give me some context as to what you're trying to do, perhaps I can help you come up with a solution.
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