Could I have ordered a negative number of pizzas at a corner store? For that I probably should bake those pizzas myself, bring them over to the store, and ask the proprietor to pay me back. "Hey, there's some pizza for you guys! No delivery charges."
Yesterday a user discovered unusually high number of items on daily back order report. When I looked into the issue I found that all those items had negative ordered counts. I still have not figured out why that happened. But there's one thing I am sure about: had I created a constraint, today I would have one thing less to worry about.
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