在大多数情况下的数据必须有三列：标识，名称及家长行标识符。

In most cases data must have three columns: Identifier, Name and Identifier of parent row.

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如果列包含无法写入的不变的行标识符，并且除了标识行外没有其他有意义的值，则设置该值。

Set if the column contains a persistent row identifier that cannot be written to, and has no meaningful value except to identity the row.

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行标识符(RID_BIT或RID)内置函数：该内置函数可用于SELECT列表或谓词语句。

Row identifier (RID_BIT or RID) built-in function: This built-in function can be used in the SELECT list or predicates statement.

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