我在分配后在select标签中获得值，它不应该显示在select标签中

*Parent table* : Vehicle

*父表*:车辆

CREATE TABLE `vehicle` (
    `vehicle_id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    `version_number` INT(10) UNSIGNED NULL DEFAULT '0',
    `vehicle_no` VARCHAR(64) NOT NULL COLLATE 'utf8_bin',
    `vehicle_reg_no` VARCHAR(64) NOT NULL COLLATE 'utf8_bin',
    `vehicle_name` VARCHAR(64) NOT NULL COLLATE 'utf8_bin',
    `total_seat` INT(15) NOT NULL,
    `route_id` INT(10) UNSIGNED NOT NULL,
    `available_seat` INT(10) UNSIGNED NOT NULL,
    PRIMARY KEY (`vehicle_id`)
)
CREATE TAB