Haha, I would love to know if something like that would work
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In case this doesn't make sense to anyone, an SQL injection is a way of executing code on a database when you're not supposed to, buy breaking the rules of text input. As the number plate camera isn't expecting to see any database commands, it may not clean the data for this sort of input (like we use for the text boxes on this site) and just run anything it sees - in this case a command to delete everything!