The hierarchical query clause consists of two portions.

分级查询子句由两部分组成。

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The hierarchical query clause is easier to understand than the RCTE syntax.

与 RCTE 语法相比，分级查询子句较更容易理解。

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To get all subordinates over all levels, the PRIOR operator must be added to the CONNECT BY part of the hierarchical query clause.

要获取所有级别上的所有下属，必须将PRIOR运算符添加到分级查询子句的CONNECT BY部分。

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