1Z0-052 中英文解析(3)

Which two operations can be performed on an external table? (Choose two.)

A. Create a view on the table

B. Create an index on the table

C. Create a synonym on the table

D. Add a virtual column to the table

E. Update the table using the UPDATE statement

F. Delete rows in the table using the DELETE command

哪两种操作可以在外部表执行?(选择两个)

A. 在表上创建视图

B. 在表上创建索引

C. 在表上创建同义词

D. 在表上增加一个虚拟列

E. 使用UPDATE语句更新表

F. 使用 DELETE命令删除行

知识点:

外部表(external table)

  1. 是操作系统文件,改其数据只能通过修改数据文件
  2. 只读文件,可以查询操作和连接
  3. 不可以在上面运行任何 DML 操作,不能使用insert、update、delete等操作,不能建立索引
  4. 外部表可以加载和卸载数据泵格式的数据
时间: 2024-10-05 04:56:35

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