SQL 取树结构下的所有子节点集合（COLLATE DATABASE_DEFAULT）

 1 SET ANSI_NULLS ON
 2 GO
 3 SET QUOTED_IDENTIFIER ON
 4 GO
 5 
 6 CREATE FUNCTION [dbo].[fn_GetSubCasNoTree](@CAS_NO VARCHAR(20))
 7 RETURNS  @CAS TABLE
 8 (
 9  CAS_NO VARCHAR(20) COLLATE DATABASE_DEFAULT,这个不加SQL2000会报错。
10  LEVEL INT
11 ) 
12  
13 AS 
14 BEGIN 
15   DECLARE @LEVEL int
16   SET @LEVEL = 1
17   INSERT INTO @CAS SELECT @CAS_NO , @LEVEL
18   WHILE @@ROWCOUNT > 0
19   BEGIN
20  SET @LEVEL = @LEVEL + 1
21  INSERT INTO @CAS SELECT A.CAS_NO , @LEVEL
22  FROM CASN A , @CAS B
23  WHERE A.UP = B.CAS_NO and B.LEVEL = @LEVEL - 1
24   END
25 RETURN
26 END