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In my dbms book , definition of superkey is not clear in this example.
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Assuming you mean serial# as VIN and reg# as license-plate...Why would someone choose serial# over the state plus reg# because the search for a car would be faster just give me the serial# and boom I have the car. Consider the state plus reg# now you have to ask does the state match yes okay now does the reg# match bingo we found the car.