ALTER TABLE VehicleViability 
CHANGE COLUMN fuel_average unit_fuel_average decimal(6,2) NOT NULL,
CHANGE COLUMN fuel_cost unit_fuel_cost decimal(8,2) NOT NULL,
CHANGE COLUMN num_tyes num_tyres tinyint(3) UNSIGNED NOT NULL,
CHANGE COLUMN tyre_cost unit_tyre_cost decimal(8,2) NOT NULL;

