修改数据库中已有列的属性

alter table 表名 ADD default getdate() for addtime, default 0 for djnumb, default 0 for hfnumb, default 0 for cwnumb, default 0 for xjnumb, default 0 for ljnumb, default 0 for zjnumb, default 0 for gsnumb, default 0 for deltype, default '2007-6-1' for tjtime, default getdate() for zdtime, default getdate() for fctime, default 0 for zhiding, default 0 for olxxid, default 0 for xiaoqu_id, default getdate() for addtime1, default getdate() for taddtime