ORCAL递归查询，connect by prior查询

模拟数据如下：

查找21下管理的id：

 Select *
  from prpstest T
  start with T.ID = '21'
connect by prior T.Id = T.PARENTID
     ;--查找21下管理的id

效果如下

查找21010101父级及祖先信息

Select *
  from prpstest T
  start with T.ID = '21010101'
connect by nocycle prior T.PARENTID = T.ID;

效果如下