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Oracle的父子关系
原标题:Parent child relationship in Oracle

I have a parent child relationship stored in a table consider the following example

Id        Name    ParentId
------------------------------
1         Node1      -1
2         Node2      -1
3         Node3       1
4         Node4       1
5         Node5       3
6         Node6       5
7         Node7       2

这里的 PacleId = - 1 表示这是一个根端节点。 现在我要写入一个 SQL 查询, 它将返回父类各个级别的孩子 。

例如,对于ID=1,它应返回3、4、5、6。

Parent     Child   
-------------------
1            3    
1            4    
1            5    
1            6    

我指的是"https://stackoverflow.com/ questions/207309/sql-query-for-parent-child-relations" 这个问题 ,但对于sql-server来说,它不是理想的输出。

最佳回答
 select parentid parent, id child
   from table1
connect by prior id = parentid
  start with parentid = 1
问题回答

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