The node name structure should consist of alpha-numeric characters only.

节点名应该只由字母数字字符组成。

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For our example, item_id is a char column that stores only numeric characters, as we indicate in the following statement.

对于我们的例子，item_id是一个char列，它只存储数字字符，如以下语句所示。

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However, if the column is a character data type and contains only numeric characters, you can indicate this by setting the NUMERIC_STRING option to 'y.'

然而，如果列是字符数据类型，并且只包含数字字符，那么可以通过将NUMERIC_STRING选项设置为“Y”来表明这一点。

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