The pseudo column LEVEL is used in a string to make the hierarchy visible.

可在字符串中使用伪列LEVEL，使分层结构变得可视。

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In the following example, the pseudo column LEVEL is specified on the select list.

在下列示例中，在选择列表中指定伪列LEVEL。

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LEVEL - the pseudo column LEVEL returns an integer value that represents the recursive step in the hierarchy at which the row was produced.

LEVEL—伪列LEVEL返回一个整数值，表示所生成行的分层结构中的递归步骤。

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Super Paper Mario gave us a few hints by providing the player with the option to switch between 2D side-scrolling and pseudo-3D level interactions.

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