Oracle中递归查询抓有层级结构的表的数据

自上而下，向下抓层级树结构：

select * from daa_f
start with daachnl = '01'
connect by nocycle prior daachnl = daa002;

　　自下而上，向上抓层级树结构：

select * from daa_f
start with daachnl = '01'
connect by nocycle daachnl = prior  daa002;