查询dual表出错

在oracle 10g数据库中,执行以下操作出错该如何解决?
SQL> connect apm
Enter password:
SP2-0575: Use of Oracle SQL feature not in SQL92 Entry Level.
Connected.
SQL> select * from dual;
select * from dual
              *
ERROR at line 1:
ORA-00942: table or view does not exist