We first introduce methods of finding the sum of the first n terms for an arithmetic sequence of higher order.
我们首先介绍了高阶等差数列前 n 项和的求解方法。
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。
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