将以下mysql语句转换成kingbase语句

alter table user modify ticket varchar (12) null;

有没有数据库客户端，在客户端修改吧
https://jingyan.baidu.com/article/d5c4b52beca06b9b570dc567.html


ALTER TABLE user ALTER COLUMN "ticket" TYPE varchar(12) ; 

ALTER TABLE user ALTER COLUMN ticket TYPE  varchar (12) SET DEFAULT NULL;

ALTER TABLE `user` MODIFY `ticket`  varchar (12)  NULL;

ALTER TABLE user MODIFY ticket  varchar (12)  ALTER COLUMN ticket SET DEFAULT NULL;


ALTER TABLE `user` ALTER COLUMN `ticket` TYPE varchar(12) SET DEFAULT null;

表名和字段都加上反引号