ALTER TABLE `bus_driver` 
CHANGE COLUMN `drive_license_bdr` `drive_license_bdr` VARCHAR(20) NULL ,
CHANGE COLUMN `license_expire_date_bdr` `license_expire_date_bdr` DATE NULL ,
ADD COLUMN `is_companion_bdr` ENUM('YES','NO') NULL DEFAULT 'NO' AFTER `license_expire_date_bdr`;