SQL递归CTE“何处使用” / BOM爆炸(SQL Recursive CTE 'wher

我试图简单地做的是从BOM表中的项目（物料清单）得到它的相关部件/产品BOMVERSION，然后对这些相关的组件/产品得到他们的相关部件和产品等下降到7级。那么我想转动的结果，使相关项目投入列获得0, 1, 2, 3, 4, 5, 6, 7

请参阅案例数据和代码。我使用的是动态AX 2012 R2，但这个例子可以应用到使用的材料/产品的任何系统。我不能让我的却查询完成（我知道我没有dataareaid和分区我已经离开了为简单起见）。的关系是从BOM表中的itemid通过BOMID在BOMVERSION到为itemid相关。

更新：我已经简化数据等方面做出简单/清晰越好，这样的材料木材，金属，玻璃可以进入制作各种产品和材料本身，并且可以结合起来，使产品或材料。因此，我想用一个基本组件开始，然后通过水平爆炸的关系了。

DDL + DML：

    USE tempdb;

IF OBJECT_ID('tempdb..#BOM') IS NOT NULL
    DROP TABLE #BOM;

CREATE TABLE #BOM
    (
      ITEMID NVARCHAR(10) ,
      BOMID NVARCHAR(10) ,
      MATERIALNAME NVARCHAR(10)
    );

INSERT  INTO #BOM
VALUES  ( N'113621', -- ITEMID - nvarchar(10)
          N'1',  -- BOMID - nvarchar(10)
          N'Wood'  -- MATERIALNAME - nvarchar(10)
          );

INSERT  INTO #BOM
VALUES  ( N'234517', -- ITEMID - nvarchar(10)
          N'2',  -- BOMID - nvarchar(10)
          N'Metal'  -- MATERIALNAME - nvarchar(10)
          );

INSERT  INTO #BOM
VALUES  ( N'378654', -- ITEMID - nvarchar(10)
          N'3',  -- BOMID - nvarchar(10)
          N'Glass'  -- MATERIALNAME - nvarchar(10)
          );

IF OBJECT_ID('tempdb..#BOMVERSION') IS NOT NULL
    DROP TABLE #BOMVERSION;

CREATE TABLE #BOMVERSION
    (
      ITEMID NVARCHAR(10) ,
      BOMID NVARCHAR(10) ,
      NAME NVARCHAR(20)
    );

INSERT  INTO #BOMVERSION
VALUES  ( N'113477', -- ITEMID - nvarchar(10)
          N'1', -- BOMID - nvarchar(10)
          N'Oak'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113608', -- ITEMID - nvarchar(10)
          N'1', -- BOMID - nvarchar(10)
          N'Pine'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113622', -- ITEMID - nvarchar(10)
          N'1', -- BOMID - nvarchar(10)
          N'Wood Table'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113683', -- ITEMID - nvarchar(10)
          N'2', -- BOMID - nvarchar(10)
          N'Aluminium'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113689', -- ITEMID - nvarchar(10)
          N'2', -- BOMID - nvarchar(10)
          N'Steel'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113693', -- ITEMID - nvarchar(10)
          N'2', -- BOMID - nvarchar(10)
          N'Metal table'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113694', -- ITEMID - nvarchar(10)
          N'3', -- BOMID - nvarchar(10)
          N'Glass'  -- NAME - nvarchar(10)
          );

INSERT  INTO #BOMVERSION
VALUES  ( N'113695', -- ITEMID - nvarchar(10)
          N'3', -- BOMID - nvarchar(10)
          N'Glass BookCase'  -- NAME - nvarchar(10)
          );

--Query

WITH    BOM1
          AS ( SELECT   B.ITEMID AS BITEMID ,
                        BV.ITEMID AS BVITEMID ,
                        B.MATERIALNAME ,
                        B.BOMID
               FROM     #BOM AS B
                        JOIN #BOMVERSION AS BV ON BV.BOMID = B.BOMID
             ),
        EXPLODE
          AS ( SELECT   B.BITEMID ,
                        B.MATERIALNAME ,
                        B.BVITEMID ,
                        B.BOMID ,
                        0 AS [Level]
               FROM     BOM1 AS B
               UNION ALL
               SELECT   B.BITEMID ,
                        E.MATERIALNAME ,
                        E.BVITEMID ,
                        E.BOMID ,
                        [E].[Level] + 1
               FROM     EXPLODE AS E
                        JOIN BOM1 AS B ON B.BOMID = E.BOMID
               WHERE    E.Level <= 6   --narrowing levels                   
             )
    SELECT  *
    FROM    EXPLODE PIVOT ( MAX(BVITEMID) FOR Level IN ( [0], [1], [2], [3],
                                                         [4], [5], [6], [7] ) ) AS PVTBOM;

输出看起来像

嗯，这只是为了消除错误，并得到结果，但我不知道，如果结果是正确的：

WITH    BOM1
          AS ( SELECT   B.ITEMID AS BITEMID ,
                        BV.ITEMID AS BVITEMID ,
                        B.BOMID
               FROM     #BOM AS B
                        JOIN #BOMVERSION AS BV ON BV.BOMID = B.BOMID
             ),
        EXPLODE
          AS ( SELECT   B.BITEMID ,
                        B.BVITEMID ,
                        B.BOMID ,
                        0 AS [Level]
               FROM     BOM1 AS B
               UNION ALL
               SELECT   B.BITEMID ,
                        E.BVITEMID ,
                        E.BOMID ,
                        [E].[Level] + 1
               FROM     EXPLODE AS E
                        JOIN BOM1 AS B ON B.BOMID = E.BOMID
               WHERE e.Level <= 6   --narrowing levels                   
             )


    SELECT  *
    FROM    EXPLODE PIVOT ( MAX(BVITEMID) FOR Level IN ( [0], [1], [2], [3],
                                                         [4], [5], [6], [7] ) ) AS PVTBOM

你有maxrecursion = 7 -这不是缩小水平的地方。水平是递归部分内缩小CTE 。

我怀疑你的递归没有很好地组织起来，这样你就可以简化您的测试数据？只要留下几行并显示预期的输出。

EDIT1：

WITH    p AS ( SELECT   *
               FROM     ( SELECT    itemid ,
                                    bomid ,
                                    ROW_NUMBER() OVER ( PARTITION BY Bomid ORDER BY itemid ) rn
                          FROM      #BOMVERSION
                        ) t PIVOT ( MAX(itemid) FOR rn IN ( [1], [2], [3], [4],
                                                            [5], [6], [7], [8] ) ) p
             )
    SELECT  *
    FROM    #bom b
JOIN p ON b.bomid = p.bomid

EDIT2：

;WITH    cte
          AS ( SELECT   b.itemid AS originalitem ,
                        b.bomid AS originalbom ,
                        b.bomid ,
                        bv.itemid AS parent ,
                        0 AS level
               FROM     #BOM b
                        JOIN #BOMVERSION bv ON bv.bomid = b.bomid
               UNION ALL
               SELECT   c.originalitem ,
                        c.originalbom ,
                        b.bomid ,
                        bv.itemid ,
                        c.level + 1
               FROM     cte c
                        JOIN #BOM b ON c.parent = b.itemid
                        JOIN #BOMVERSION bv ON bv.bomid = b.bomid
               WHERE    c.level <= 6
             ),
        tree
          AS ( SELECT   originalitem ,
                        originalbom ,
                        parent ,
                        level
               FROM     cte
             )
    SELECT  *
    FROM    tree PIVOT ( MAX(parent) FOR level IN ( [0], [1], [2], [3], [4], [5], [6], [7] ) ) AS p