Oracle 12c 数据库做了很大的改变，集成了SQLDeveloper,可以方便大家的使用，scott用户已经被移除了，需要的话可以自己创建，并授予权限。这个稍微有点基础的话都是很简单的……按着步骤来就可以。
-- 使用超级管理员登录
CONN sys/change_on_install AS SYSDBA ;
-- 创建c##scott用户
CREATE USER c##scott IDENTIFIED BY tiger ;
-- 为用户授权
GRANT CONNECT,RESOURCE,UNLIMITED TABLESPACE TO c##scott CONTAINER=ALL ;
-- 设置用户使用的表空间
ALTER USER c##scott DEFAULT TABLESPACE USERS;
ALTER USER c##scott TEMPORARY TABLESPACE TEMP;
-- 使用c##scott用户登录
CONNECT c##scott/tiger
==退出plus 重新登录一次
建议使用sql devploer 链接scott执行以下脚本。
-- 创建数据表
CREATE TABLE dept (
deptno NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY,
dname VARCHAR2(14) ,
loc VARCHAR2(13)
) ;
CREATE TABLE emp (
empno NUMBER(4) CONSTRAINT PK_EMP PRIMARY KEY,
ename VARCHAR2(10),
job VARCHAR2(9),
mgr NUMBER(4),
hiredate DATE,
sal NUMBER(7,2),
comm NUMBER(7,2),
deptno NUMBER(2) CONSTRAINT FK_DEPTNO REFERENCES DEPT
);
CREATE TABLE bonus (
enamE VARCHAR2(10) ,
job VARCHAR2(9) ,
sal NUMBER,
comm NUMBER
) ;
CREATE TABLE salgrade (
grade NUMBER,
losal NUMBER,
hisal NUMBER
);
-- 插入测试数据 —— dept
INSERT INTO dept VALUES (10,'ACCOUNTING','NEW YORK');
INSERT INTO dept VALUES (20,'RESEARCH','DALLAS');
INSERT INTO dept VALUES (30,'SALES','CHICAGO');
INSERT INTO dept VALUES (40,'OPERATIONS','BOSTON');
-- 插入测试数据 —— emp
INSERT INTO emp VALUES (7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20);
INSERT INTO emp VALUES (7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30);
INSERT INTO emp VALUES (7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30);
INSERT INTO emp VALUES (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20);
INSERT INTO emp VALUES (7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30);
INSERT INTO emp VALUES (7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30);
INSERT INTO emp VALUES (7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10);
INSERT INTO emp VALUES (7788,'SCOTT','ANALYST',7566,to_date('13-07-87','dd-mm-yyyy')-85,3000,NULL,20);
INSERT INTO emp VALUES (7839,'KING','PRESIDENT',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10);
INSERT INTO emp VALUES (7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30);
INSERT INTO emp VALUES (7876,'ADAMS','CLERK',7788,to_date('13-07-87','dd-mm-yyyy')-51,1100,NULL,20);
INSERT INTO emp VALUES (7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30);
INSERT INTO emp VALUES (7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20);
INSERT INTO emp VALUES (7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10);
-- 插入测试数据 —— salgrade
INSERT INTO salgrade VALUES (1,700,1200);
INSERT INTO salgrade VALUES (2,1201,1400);
INSERT INTO salgrade VALUES (3,1401,2000);
INSERT INTO salgrade VALUES (4,2001,3000);
INSERT INTO salgrade VALUES (5,3001,9999);
-- 事务提交
COMMIT;
范例：查询emp表数据（指令之后要使用“;”完结）
SELECT * FROM emp ;
范例：使用ed命令调用本机记事本程序
ED mldn
范例：使用SYS用户登录
CONN sys/change_on_install AS SYSDBA ;
范例：在sys用户中查询c##scott.emp表数据
SELECT * FROM c##scott.emp ;
范例：使用sys用户以管理员方式登录
CONN sys/change_on_install AS SYSDBA ;
范例：将CDB的切换到PDB
ALTER SESSION SET CONTAINER=pdbmldn ;
范例：打开PDBMLDN可插入数据库
ALTER DATABASE pdbmldn OPEN ;
范例：通过CDB打开PDBMLDN可插入数据库
ALTER PLUGGABLE DATABASE pdbmldn OPEN ;
范例：在PDBMLDN下察看scott与sh用户是否存在
SELECT username FROM dba_users WHERE username='SCOTT' OR username='SH' ;
范例：查询scott用户
SELECT * FROM scott.emp ;
范例：切换回CDB容器
ALTER SESSION SET CONTAINER=CDB$ROOT ;
范例：察看dept的表结构
DESC dept ;
范例：使用copy指令
HOST COPY D:\mldn.sql D:\hello.sql
范例：查询emp表
SELECT * FROM emp ;