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字段中的默认值很可能是通过使用upc符号作为键值从一个数据库或运营系统中检索到的。
The default values in the field would most likely be retrieved from a database or operational system, using the UPC symbol as the key value.
在这种情况下，返回R PG的行取决于创建键逻辑文件时使用的是哪个用于处理DDS关键字的重复键(LIFO(默认值)、FIFO或LCFO)。
In this case the row returned to RPG is dependent on which of the duplicate key handling DDS keywords (LIFO (default), FIFO or LCFO) were used when creating the keyed logical file.
此外，需求的使用还可以通过use属性设置为required, optional或prohibited(默认值为required)。
Additionally, a usage of the requirement can also be set as required, optional, or prohibited through the use attribute (the default value is required).
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