create database if not exists uav_airspace DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_bin;
use uav_airspace;
alter table zyd_airspace
    modify appli_time datetime not null comment '申請日期';

alter table zyd_airspace
    modify start_time datetime not null comment '起始时间';

alter table zyd_airspace
    modify end_time datetime not null comment '结束时间';
	
	
ALTER TABLE `uav_airspace`.`zyd_airspace` 
MODIFY COLUMN `area_range` text NOT NULL COMMENT '空域范围';