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！
  

在oracle中操作表及字段注释