两个表或源之间的标识符引用是否完整？

Is the reference of an identifier between two tables or sources intact?

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FETCH：使用指定的记录标识符从表中读取列。

FETCH: Fetches columns from a table using a specific record identifier.

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反过来，REFERENCE是一个系统类型，它是任何类型化表的对象标识符的数据类型。

REFERENCE, in turn, is a system type that is the data type of the object identifier column of any typed table.

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