使用SQLSERVER2005/2008递归CTE查询树型结构的方法

我们经常遇到树型结构，把它们显示在一个类似TreeView控件上的情况。这时我们可以使用Recursive Common Table Expressions(CTE)实现

DECLARE @TT TABLE (ID int,Relation varchar(25),Name varchar(25),ParentID int) 
INSERT @TT SELECT 1,' Great GrandFather' , 'Thomas Bishop', null UNION ALL 
SELECT 2,'Grand Mom', 'Elian Thomas Wilson' , 1 UNION ALL 
SELECT 3, 'Dad', 'James Wilson',2 UNION ALL 
SELECT 4, 'Uncle', 'Michael Wilson', 2 UNION ALL 
SELECT 5, 'Aunt', 'Nancy Manor', 2 UNION ALL 
SELECT 6, 'Grand Uncle', 'Michael Bishop', 1 UNION ALL 
SELECT 7, 'Brother', 'David James Wilson',3 UNION ALL 
SELECT 8, 'Sister', 'Michelle Clark', 3 UNION ALL 
SELECT 9, 'Brother', 'Robert James Wilson', 3 UNION ALL 
SELECT 10, 'Me', 'Steve James Wilson', 3 

----------Query--------------------------------------- 
;WITH FamilyTree 
AS( 
SELECT *, CAST(NULL AS VARCHAR(25)) AS ParentName, 0 AS Generation FROM @TT 
WHERE ParentID IS NULL 
UNION ALL 
SELECT Fam.*,FamilyTree.Name AS ParentName, Generation + 1 FROM @TT AS Fam 
INNER JOIN FamilyTree ON Fam.ParentID = FamilyTree.ID 
)SELECT * FROM FamilyTree 

Output:


希望对您有帮助 

Author: Petter Liu