dos中要sqlplus进入oracle 用户名:system 密码:12345### SQL>show user; SQL>connect system as sysdba; SQL>conn scott;/密码 SQL>alter user scott identified by 新密码;//修改密码 SQL>alter user scott account unlock;//解锁 SQL>exit/quit SQL> //查询入职最早的排在第3(不包含)-6位的员工 select empno,ename,hiredate from( select empno,ename,hiredate,rownum rn from( select empno,ename,hiredate from emp order by hiredate ) ) where rn>3 and rn<=6;
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