create user xiaoming identified by 123;
password xiaoming;
drop user xiaoming;
grant connect to xiaoming [with admin option];
conn xiaoming/123
grant resource to xiaoming;//可以建表了
create table test(userid varchar2(30),username varchar2(30));
grant select/update/all on emp to xiaoming [with grant option 可以把权限传递]
revoke select on emp from xiaoming
权限传递中上级被回收 ，下级也被 回收了
select * from scotte.emp;
role:
connect/dba/resource
用户管理
创建profile文件 只能试3次，锁定2天
create profile lock_account limit failed_login_attempts 3 password_lock_time 2;
alter user scotte tee profile lock_account;
alter user scott account unlock;
终止口令 每10天要改密码，宽限2天
create profile myprofile limit password_life_time 10
password_grace_time 2;
alter user scott profile myprofile;
口令历史
create profile password_history limit password_life_time 10 password_grace_time 2 password_reuse_time 10
drop profile password_history
表的管理
基本查询
alter session set nls_date_format='yyyy-mm-dd';
create table student(
xh char(4),
xm varchar2(20),
sex char(2),
birthday date,
sal number(7,2)
);
col ename heading “名字” format a40
select sal*3+nvl(comm,0）*13 "anumal sal",ename from emp;