-- 創(chuàng)建表: student_info 屬主: scott (默認(rèn)當(dāng)前用戶)

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

-- 添加注釋
comment on table scott.student_info is '學(xué)生信息表';
comment on column scott.student_info.sno is '學(xué)號(hào)';
comment on column scott.student_info.sname is '姓名';
comment on column scott.student_info.sex is '性別';
comment on column scott.student_info.create_date is '創(chuàng)建日期';

-- 語句授權(quán)，如：給 hr 用戶下列權(quán)限
grant select, insert, update, delete on scott.student_info to hr;

-- 插入數(shù)據(jù)
insert into scott.student_info (sno, sname, sex, create_date)
values (1, '張三', '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;
 
-- 刪除 
delete scott.student_info si where si.sno = 1; 

-- 提交
commit; 

-- 查詢
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);

-- 刪除表結(jié)構(gòu)
drop table scott.student_info;

-- 清空表數(shù)據(jù)
truncate table scott.student_info;

'dba_xx' > all_xx > user_xx （'dba_xx' DBA 用戶才有權(quán)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;