这些目录表用于存储本文讨论的表选项、数据文件和外部列。
These catalog tables are needed to store the table options, data files, and external columns discussed in this article.
外部表可以使用IDS中的常规基表支持的所有数据类型的列创建。
External tables can be created with the columns of all the data types supported by the regular base table in IDS.
DBDATE：外部数据文件中的日期列值采用由这个DBDATE指定的格式。
DBDATE: the date column values in the external data file are in the format specified by this DBDATE.
DBMONEY：外部数据文件中的货币列值的货币符号采用由DBMONEY指定的格式。
DBMONEY: the currency symbol for the money column values in the external data file are in the format specified by the DBMONEY.
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。
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。
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.
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