创建一个物理文件，并使用CCSID子句。

Create a physical file and use the CCSID clause.

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类型子句也指定了传入键和值，这对于读取文件分别是字节数和文本行数。

The type clause also delineates the incoming key and value, which in the case of reading a file are the byte count and the line of text, respectively.

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DATAFILES是每个外部表的必需子句，它指定读写数据的文件路径。

DATAFILES is a mandatory clause for each external table. It specifies the file path where the data can be read from or written to.

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