Oracle 树操作

select…start with…connect by…prior

1.查找一个节点的所有直属子节点（节点本身+所有后代），有以下两种写法。

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
　　start with id = '15'
　　connect by parentid = prior id
　　order siblings by ordernum

或

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
　　start with id = '15'
　　connect by prior id = parentid
　　order siblings by ordernum

显示结果：

2.查找一个节点的所有直属父节点（节点本身+所有祖宗（父类的父类....））。

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
　　start with id = '136'
　　connect by id = prior parentid
　　order siblings by ordernum

或

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
start with id = '136'
connect by prior parentid = id
order siblings by ordernum

显示结果：

转载于:https://www.cnblogs.com/chengx/p/5910227.html