For hierarchical queries several pseudo columns are provided.
在分级查询中，提供了几个伪列。
You should now be able to create all kinds of recursive queries with either hierarchical or bi-directional relationships using
现在您应该能够使用下列语句创建具有分层或双向关系的所有类型的递归查询
You should now be able to create all kinds of recursive queries with either hierarchical or bi-directional relationships using
现在您应该能够使用下列语句创建具有分层或双向关系的所有类型的递归查询
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