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I support a software package which controls our company's store replenishment. It contains a pretty robust high-level pseudo-SQL which the clients can run. I got a call the day AFTER they ran a set of selects with "or <>" instead of "and <>". They ended up setting the store-level presentation stock for every item in our system (2 million +) to 10. Thankfully the warehouse people were wondering why we were trying to send 10 pairs of size 14 hiking boots to a store across the country. It only took me about 8 hours to repair the database.
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