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  • -1 for assuming this is a one-to-one relationship. "a vehicle can be advertised multiple times over its lifespan". Commented Sep 16, 2013 at 10:09
  • the op edited their schema, moving "mileage" from vehicle to advert. There was even a note that multiple adverts would be very uncommon. Commented Sep 16, 2013 at 17:41