NLS_DUAL_CURRENCY $ NLS_NCHAR_CHARACTERSET AL16UTF16 NLS_COMP BINARY NLS_LENGTH_SEMANTICS BYTE NLS_NCHAR_CONV_EXCP FALSE 5、查看类型: SQL> select systimestamp from dual; / SYSTIMESTAMP --- 11-2月 -18 09.38.29.190818 上午 +08:00 6、导入数据: SQL> @ Importing table SYS_AREA......