启动数据库的步骤

1.登录到 oracle

su - oracle

2.启动 监听

$ lsnrctl start

3. 启动数据库

$ sqlplus /nolog

sql>conn / as sysdba

sql>startup

4.解锁hr用户

sql> alter user hr identified by hr account unlock;

5.登录到 hr用户

sql>conn hr/hr

6.查看有哪些表

sql>select table_name from user_tables;

7.查看表结构

sql> desc departments

8.看具体内容

sql>select * from departments;