select vehicle_departure_log.*,vehicle.number_plate,IFNULL(DATEDIFF(vehicle_departure_log.arrival_time,vehicle_departure_log.departure_time),0) as departureDay,
IF((IFNULL(vehicle_departure_log.mileage_end,0)-IFNULL(vehicle_departure_log.mileage_start,0))>0,IFNULL(vehicle_departure_log.mileage_end,0)-IFNULL(vehicle_departure_log.mileage_start,0),0) as mileage
from vehicle_departure_log
from vehicle_departure_log
left join vehicle on vehicle_departure_log.vehicle_id = vehicle.id
left join vehicle on vehicle_departure_log.vehicle_id = vehicle.id