在oracle中操作表及字段注释

在oracle 中创建表如下：

create table TM_FAULT_BUS_ATTENTION
(
  BUS_NO     NUMBER(6),
  LINE_NO    VARCHAR2(6),
  FILA_NO    NUMBER(3),
  BUS_JOB_NO VARCHAR2(20) not null,
  CITY_NO    NUMBER(4),
  GROUP_NO   NUMBER(4),
  INS_TIME   DATE,
  IS_SEND    NUMBER(1) default 1
);

-- Add comments to the table 
comment on table TM_FAULT_BUS_ATTENTION
  is '添加故障车辆信息表';
-- Add comments to the columns 
comment on column TM_FAULT_BUS_ATTENTION.BUS_NO
  is '车号';
comment on column TM_FAULT_BUS_ATTENTION.LINE_NO
  is '线路号';
comment on column TM_FAULT_BUS_ATTENTION.FILA_NO
  is '公司号';
comment on column TM_FAULT_BUS_ATTENTION.BUS_JOB_NO
  is '车工号';
comment on column TM_FAULT_BUS_ATTENTION.CITY_NO
  is '地区';
comment on column TM_FAULT_BUS_ATTENTION.GROUP_NO
  is '车队';
comment on column TM_FAULT_BUS_ATTENTION.INS_TIME
  is '下载时间';
comment on column TM_FAULT_BUS_ATTENTION.IS_SEND
  is '是否已发';

备注加好以后，那么如何查询呢？

查询表注释信息如下：

SELECT  TABLE_NAME,  TABLE_TYPE,  COMMENTS FROM  USER_TAB_COMMENTS WHERE  TABLE_NAME = 'TM_FAULT_BUS_ATTENTION';

查询表中字段注释信息如下：

SELECT  TABLE_NAME,  COLUMN_NAME,  COMMENTS FROM  USER_COL_COMMENTS WHERE  TABLE_NAME = 'TM_FAULT_BUS_ATTENTION';

查询表中某个字段的注释如下：

select  comments  from USER_COL_COMMENTS where table_name= 'TM_FAULT_BUS_ATTENTION' and column_name= 'LINE_NO'

注意：表名，字段名要大写！