Each row of a table is uniquely identified by a primary key composed of one or more columns. This implies that a table may not contain duplicate rows.

表的每一行都是由一个唯一的主键标识的。主键由一列或多列构成。这意味表里不会有重复的行。

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For example, if a duplicate source table row matches exactly with the same target table row that has been updated, you will see the error message.

例如，如果复制已被更新的、与相同目标表行匹配的源表行，那么您将会看到错误消息。

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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.

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)。

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