ALTER TABLE `tran_car_info` 
ADD COLUMN `billing_method` varchar(50) NULL COMMENT '计费方式(按吨，按车)' AFTER `three_tran_type`,
ADD COLUMN `fleet_name` varchar(100) NULL COMMENT '车队名称' AFTER `billing_method`,
ADD COLUMN `fleet_flag` varchar(20) NULL DEFAULT 0 COMMENT '是否车队(0否1是)' AFTER `fleet_name`;