一.系统操作cmd->sqlplus / as sysdba; //以管理员身份登录数据库alter user system account unlock; //解锁用户systemalter user scott identified by tiger; //把scott的密码改为tigergrant resource,connect to scott; //给scott赋予多个权限role 角色(connect,resource)grant 权限/角色 to 用户名 //赋予权限revoke…
Oracle笔记--SQL部分 整体框架 语句的执行顺序:from →where →group by→having→select→order by select * from * where * group by * having * order by * 关于select (1)当调用的不同表中存在相同名称的列时,需要指明表格 select student.name,class.name from student,class (2)重定义列名 select student.name as st…