alter table user add register_device_id varchar(64) null after update_time; alter table user add present_device_id varchar(64) null after register_device_id; alter table user add last_login_time datetime null after present_device_id; alter table device_detail add company varchar(64) null after user_agent; alter table device_detail add advertiser_id varchar(64) null after company; alter table device_detail add gid varchar(64) null after advertiser_id; alter table device_detail add aid varchar(64) null after gid; alter table device_detail add cid varchar(64) null after aid; alter table device_detail add attributed_time datetime null after cid;