oracle 增加字段

之前很多表增加很多相同的字段，一个一个添加太慢烦了，于是用了以下的方法
alter table t_xmlc_batch_out_head_bak add 
(  SENDRECEIVEFLAG     VARCHAR2(1) default 0,
  SENDRECEIVEOPERATOR VARCHAR2(50),
  SENDRECEIVEDATE     DATE,
  DECLAREAPPLICANT    VARCHAR2(50),
  DECLAREDATE         DATE,
  DECLAREAPPROVEFLAG  VARCHAR2(1) default 0,
  DECLAREAPPROVEDATE  DATE

);

comment on column t_xmlc_batch_out_head_bak.SENDRECEIVEFLAG
  is ‘货物实际收发标志(0-未确认；1-已确认；)‘;
comment on column t_xmlc_batch_out_head_bak.SENDRECEIVEOPERATOR
  is ‘货物实际收发人    ‘;
comment on column t_xmlc_batch_out_head_bak.SENDRECEIVEDATE
  is ‘货物实际收发日期 ‘;
comment on column t_xmlc_batch_out_head_bak.DECLAREAPPLICANT
  is ‘货物实际申报申请人 ‘;
comment on column t_xmlc_batch_out_head_bak.DECLAREDATE
  is ‘货物实际申报日期 ‘;
comment on column t_xmlc_batch_out_head_bak.DECLAREAPPROVEFLAG
  is ‘货物实际申报审批标志‘;
comment on column t_xmlc_batch_out_head_bak.DECLAREAPPROVEDATE
  is ‘货物实际申报审批日期 ‘;