Question

我编写了SQL代码以完全爆炸所有物料清单：

这是表格数据：

CREATE TABLE bomline(
   itemno VARCHAR(6) NOT NULL
  ,compno VARCHAR(6) NOT NULL 
  ,quantity NUMERIC(9,6) NOT NULL
  ,PRIMARY KEY(itemno,compno)
);
INSERT INTO bomline(itemno,compno,quantity) VALUES ('1000','1100',2.000000);
INSERT INTO bomline(itemno,compno,quantity) VALUES ('1100','1200',3.000000);
INSERT INTO bomline(itemno,compno,quantity) VALUES ('2000','2100',4.000000);
INSERT INTO bomline(itemno,compno,quantity) VALUES ('2100','2200',2.000000);

这是我的SQL代码：

WITH tmpbom([itemno], [compno], [quantity], [level]) 
     AS (SELECT S1.[itemno], 
                S1.[compno], 
                CAST(S1.[quantity] AS NUMERIC), 
                1 
         FROM   bomline AS S1 
         UNION ALL 
         SELECT S2.[itemno], 
                S2.[compno], 
                CAST(S2.[quantity] * TS.[quantity] AS NUMERIC), 
                TS.[level] + 1 
         FROM   bomline AS S2 
                INNER JOIN tmpbom AS TS 
                        ON S2.[itemno] = TS.[compno]) 
SELECT [itemno], 
       [compno], 
       Isnull(quantity, 0) AS [quantity] 
FROM   tmpbom

这就是我现在所得到的：

+--------+---------+-----------+
| ItemNo | CompNo  | Quantity  |
+--------+---------+-----------+
| 1000   | 1100    |  2.000000 |
| 1100   | 1200    |  3.000000 |
| 2000   | 2100    |  4.000000 |
| 2100   | 2200    |  2.000000 |
| 2100   | 2200    |  8.000000 |
| 1100   | 1200    |  6.000000 |    
+--------+---------+-----------+

我希望得到这个结果，其中所有子组件都与其累积数量的顶级ItemNos相关：

+--------+---------+-----------+
| ItemNo | CompNo  | Quantity  |
+--------+---------+-----------+
| 1000   | 1100    |  2.000000 |
| 1000   | 1200    |  6.000000 |
| 2000   | 2100    |  4.000000 |
| 2000   | 2200    |  8.000000 |    
+--------+---------+-----------+

Answer 1

首先，项目不在compno中的值

    SELECT
        BL.itemno,
        BL.compno,
        BL.quantity
    FROM
        dbo.bomline BL LEFT JOIN 
        dbo.bomline CBL ON BL.itemno = CBL.compno
    WHERE
        CBL.itemno IS NULL

第一次查询的输出：

    itemno compno quantity
    ------ ------ ---------
    1000   1100   2.000000
    2000   2100   4.000000

第二次查询：

    SELECT
        BL.itemno,
        PBL.compno,
        BL.quantity * PBL.quantity AS quantity
    FROM
        dbo.bomline BL INNER JOIN 
        dbo.bomline PBL ON BL.compno = PBL.itemno

第二次查询的输出：

    itemno compno quantity
    ------ ------ ---------------
    1000   1200   6.000000
    2000   2200   8.000000

结果：

    SELECT
        BL.itemno,
        BL.compno,
        BL.quantity
    FROM
        dbo.bomline BL LEFT JOIN 
        dbo.bomline CBL ON BL.itemno = CBL.compno
    WHERE
        CBL.itemno IS NULL

    UNION ALL

    SELECT
        BL.itemno,
        PBL.compno,
        BL.quantity * PBL.quantity AS quantity
    FROM
        dbo.bomline BL INNER JOIN 
        dbo.bomline PBL ON BL.compno = PBL.itemno

结果输出：

    itemno compno quantity
    ------ ------ --------------
    1000   1100   2.000000
    1000   1200   6.000000
    2000   2100   4.000000
    2000   2200   8.000000

输出物料清单的顶级物料编号

1 个答案: