first-order clause 一阶子句
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。
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。
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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