Oracle创建表语句详解

-- 创建表: student_info 属主: scott (默认当前用户)

create table scott.student_info (
  sno         number(10) constraint pk_si_sno primary key,
  sname       varchar2(10),
  sex         varchar2(2),
  create_date date
);

-- 添加注释
comment on table scott.student_info is '学生信息表';
comment on column scott.student_info.sno is '学号';
comment on column scott.student_info.sname is '姓名';
comment on column scott.student_info.sex is '性别';
comment on column scott.student_info.create_date is '创建日期';

-- 语句授权，如：给 hr 用户下列权限
grant select, insert, update, delete on scott.student_info to hr;

-- 插入数据
insert into scott.student_info (sno, sname, sex, create_date)
values (1, '张三', '男', sysdate);
insert into scott.student_info (sno, sname, sex, create_date)
values (2, '李四', '女', sysdate);
insert into scott.student_info (sno, sname, sex, create_date)
values (3, '王五', '男', sysdate);

-- 修改
update scott.student_info si
   set si.sex = '女'
 where si.sno = 3;
 
-- 删除 
delete scott.student_info si where si.sno = 1; 

-- 提交
commit; 

-- 查询
select * from scott.student_info;

alter table scott.student_info add address varchar2(50);
alter table scott.student_info add (id_type varchar2(2), id_no varchar2(10));

alter table scott.student_info modify address varchar2(100);
alter table scott.student_info modify (id_type varchar(20), id_no varchar2(20));

alter table scott.student_info rename column address to new_address;

alter table scott.student_info rename to new_student_info ;
alter table scott.new_student_info rename to student_info;

alter table scott.student_info drop column sex;
alter table scott.student_info drop (id_type, id_no);

-- 删除表结构
drop table scott.student_info;

-- 清空表数据
truncate table scott.student_info;

'dba_xx' > all_xx > user_xx （'dba_xx' DBA 用户才有权限）

select * from dba_tables; -- all_tables、user_tables

select * from dba_tab_comments;

select * from dba_tab_cols t order by t.column_id;

select * from dba_col_comments;