The temporarily created field SORT is used within the ORDER BY clause, to get the result returned in the depth-first sequence.

临时创建的字段sort用于ORDER by子句内，以便按深度优先顺序获得返回的结果。

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The pseudo column LEVEL can be used in the ORDER BY clause to return the result set in search breadth first sequence.

可在 ORDER BY 子句中使用伪列 LEVEL 按照搜索宽度优先顺序返回结果集。

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The authors updated clause searching method to first-order by partial instantiation method.

结合部分实例化方法将子句搜索方法提升至一阶。

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