SQLServer树形表非循环递归查询的实例详解

很多人可能想要查询整个树形表关联的内容都会通过循环递归来查...事实上在微软在SQL2005或以上版本就能用别的语法进行查询，下面是示例。

--通过子节点查询父节点
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = 6 -- 要查询的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.PId = Areas.Id
) 
SELECT Area FROM TREE
--通过父节点查询子节点
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = 7 -- 要查询的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.Id = Areas.PId
) 
SELECT Area FROM TREE 

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