CTE親子顯示兄弟姐妹

我有一個CTE查詢，顯示一棵樹使用遞歸。這顯示整個樹時很好用。但我想將ID作爲變量傳入，幷包含每個當前節點的兄弟節點。CTE親子顯示兄弟姐妹

Testcode：

DECLARE @TT TABLE 
(
ID int, 
Name varchar(25), 
ParentID int, 
SortIndex int 
) 

INSERT @TT 
SELECT 1, 'A', NULL, 1 UNION ALL 
SELECT 2, 'B_1', 3, 1 UNION ALL 
SELECT 3, 'B', 1, 2 UNION ALL 
SELECT 4, 'B_2', 3, 2 UNION ALL 
SELECT 5, 'C', 1, 3 UNION ALL 
SELECT 6, 'C_2', 5, 2 UNION ALL 
SELECT 7, 'A_1', 1, 1 UNION ALL 
SELECT 8, 'A_2', 1, 2 UNION ALL 
SELECT 9, 'C_1', 5, 1 


;WITH CTETree 
AS 
(
    SELECT *, CAST(NULL AS VARCHAR(25)) AS ParentName, 1 AS Lev, 
    CAST(ROW_NUMBER() OVER(ORDER BY SortIndex) AS VARBINARY(MAX)) AS SortPath 
    FROM @TT 
    WHERE ParentID IS NULL 

    UNION ALL 

    SELECT F.*, CTETree.Name AS ParentName, Lev + 1, 
    SortPath + CAST(ROW_NUMBER() OVER(ORDER BY F.SortIndex) AS BINARY(32)) 
    FROM @TT AS F 
    INNER JOIN CTETree 
    ON F.ParentID = CTETree.ID 
) 

SELECT * FROM CTETree 
    ORDER BY SortPath 

/* 
DESIRED RESULT: 

WHEN ID = 3 PASSED IN: 

1 A NULL 1 NULL 1 
3 B 1 2 A 2 
2 B_1 3 1 B 3 
4 B_2 3 2 B 3 
5 C 1 3 A 2 

WHEN ID = 1 PASSED IN: 

1 A NULL 1 NULL 1 
3 B 1 2 A 2 
5 C 1 3 A 2 

WHEN ID = 9 PASSED IN: 

1 A NULL 1 NULL 1 
3 B 1 2 A 2 
5 C 1 3 A 2 
9 C_1 5 1 C 3 
6 C_2 5 2 C 3 

*/

SQL-小提琴：http://sqlfiddle.com/#!3/d41d8/5526

來源

2012-10-24 Lasse Edsvik

你能解釋一下你的結果？ – podiluska

另外，你知道SQL 2008有這種類型的HierarchyID數據類型嗎？ – podiluska

請解釋得更好，'兄弟'通常表示兄弟或姐妹（同一父母），但你的結果顯示其他結果 – fnurglewitz

只有一次，我面對一個問題，在那裏消失A_1和A_2。因此添加異常（在case子句中）。如果你需要這個記錄中刪除此表達和f.ID！= 7，f.ID！= 8

DECLARE @ID int = 3 -- variable wich you want pass 
DECLARE @Matched int = (SELECT CASE WHEN ParentID = 1 THEN ID ELSE ParentID END FROM @TT WHERE ID = @ID) 
;WITH CTETree 
AS 
(
SELECT *, CAST(NULL AS VARCHAR(25)) AS ParentName, 1 AS Lev, 
     CAST(ROW_NUMBER() OVER(ORDER BY SortIndex) AS VARBINARY(MAX)) AS SortPath, 
     0 AS Matched 
FROM @TT 
WHERE ParentID IS NULL 
UNION ALL 
SELECT F.*, cte.Name AS ParentName, cte.Lev + 1, 
     SortPath + CAST(ROW_NUMBER() OVER(ORDER BY F.SortIndex) AS BINARY(32)), 
     CASE WHEN (cte.ID = 1 AND f.ID != 7 AND f.ID != 8) 
     OR (cte.ID = @Matched AND cte.Lev + 1 > 2) 
     THEN 1 END AS Matched 
FROM @TT AS F INNER JOIN CTETree cte 
ON F.ParentID = cte.ID 
) 
SELECT ID, Name, ParentID, SortIndex, ParentName, Lev FROM CTETree 
WHERE Matched IS NOT NULL 
ORDER BY SortPath

演示上SQLFiddle

來源

2012-11-16 15:33:00

CTE親子顯示兄弟姐妹

回答

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