Record from the USER table is transformed to a text file at run time.
来自user表的记录在运行时被转换为一个文本文件。
Selecting from an external table reads the data from the data file(s) and provides it in the form of rows and columns as if it was read from the normal base table.
从外部表选择可从一个或多个数据文件读取数据，并以行和列的形式提供该数据，就好像从常规基表读取数据一样。
The example here explains how to load a few rows of data in a table from a file by creating a load job.
下例解释如何通过创建加载作业来从文件中加载表的一些数据行。
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