oracle中给表和字段添加注释

文档课题：oracle中给表和字段添加注释.
数据库：oracle 11.2.0.4
1、添加注释
1.1、表注释
--添加表注释.
SYS@orcl> create table student_info
  2  (
  3   stu_id int,                  --学号
  4   stu_name varchar2(8),        --姓名
  5   email varchar2(20),          --邮箱
  6   sex char(2),                 --性别
  7   age int,                    --年龄
  8   class_id varchar2(20),        --编辑编号
  9   regdate date default sysdate   --创建时间
 10  );

Table created.

SYS@orcl> comment on table student_info is '学生信息表';

Comment created.
1.2、列注释
--添加列注释.
SYS@orcl> comment on column student_info.stu_id is '学号';

Comment created.

SYS@orcl> comment on column student_info.stu_name is '姓名';

Comment created.

SYS@orcl> comment on column student_info.email is '邮箱';

Comment created.

SYS@orcl> comment on column student_info.sex is '性别';

Comment created.

SYS@orcl> comment on column student_info.age is '年龄';

Comment created.

SYS@orcl> comment on column student_info.class_id is '班级编号';

Comment created.

SYS@orcl> comment on column student_info.regdate is '创建时间';

Comment created.
2、查询注释信息
SYS@orcl> select * from all_col_comments where table_name='STUDENT_INFO';

OWNER           TABLE_NAME      COLUMN_NAME     COMMENTS
--------------- --------------- --------------- ---------------
SYS             STUDENT_INFO    STU_ID          学号
SYS             STUDENT_INFO    STU_NAME        姓名
SYS             STUDENT_INFO    EMAIL           邮箱
SYS             STUDENT_INFO    SEX             性别
SYS             STUDENT_INFO    AGE             年龄
SYS             STUDENT_INFO    CLASS_ID        班级编号
SYS             STUDENT_INFO    REGDATE         创建时间

7 rows selected.

SYS@orcl> select * from all_tab_comments where table_name='STUDENT_INFO';

OWNER           TABLE_NAME      TABLE_TYPE  COMMENTS
--------------- --------------- ----------- -------------------------
SYS             STUDENT_INFO    TABLE       学生信息表

参考网址：https://blog.csdn.net/pan_junbiao/article/details/79951180