While some can access data in an XML column, many don't have facilities to format complex XML into a structure that is meaningful for reports.
尽管有些工具可以访问xml列中的数据，但是大部分都不能够将复杂xml格式化为对报告有用的结构。
DBDATE: the date column values in the external data file are in the format specified by this DBDATE.
DBDATE：外部数据文件中的日期列值采用由这个DBDATE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.
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。
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