父子关系的SQL查询

本文介绍了父子关系的SQL查询的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的数据库表的父子关系为:

I have db table with parent child relationship as:

NodeId NodeName ParentId ------------------------------ 1 Node1 0 2 Node2 0 3 Node3 1 4 Node4 1 5 Node5 3 6 Node6 5 7 Node7 2

此处parentId = 0表示它是根级别节点.现在，我想编写一个SQL查询，该查询将在父类别的所有级别返回子代.

Here parentId = 0 means that it is a root level node. Now I want to write an SQL Query which will return child at all level of a parent category.

例如对于nodeId = 1，应返回3、4、5、6.

e.g. for nodeId = 1, it should return 3, 4, 5, 6.

我正在使用MS SQL Server 2005

I am using MS SQL Server 2005

推荐答案

with [CTE] as ( select * from [TheTable] c where c.[ParentId] = 1 union all select * from [CTE] p, [TheTable] c where c.[ParentId] = p.[NodeId] ) select * from [CTE]