跨多个层的 SQL 循环/递归答案

【问题标题】：SQL Loop/recursion across multiple layers跨多个层的 SQL 循环/递归
【发布时间】：2019-10-26 23:21:22
【问题描述】：

我现在有点不知所措！帮我stackoverflow，你是我唯一的希望。

目标是使用 SQL 和一些表格计算最终生产 SKU 所需的材料数量。

我几乎有一个工作代码，但它是一团糟，所以我需要有关格式的帮助，如果可以通过其他方式做到这一点。

如果 SKU 有半成品，则需要根据最终 SKU 所需的半成品和数量考虑并计算所需的材料。

I.E.如果 SKU 1001 需要 0.2 件半成品 9001。那么制作一个 9001 所需的材料需要乘以 0.2 为 SKU 1001 的材料需求。

这有多个层次，一个成品可能最终需要 5 层不同的半成品。

作为奖励，需要包括以天为单位的生产提前量，以根据生产预测计算每天的材料需求。（需要多少天才能生产出最终的SKU半成品）

我认为为此使用 CTE 可能是正确的方法，而不是联合，但我无法弄清楚。代码之后是表格和示例数据。

包含代码。真是一团糟。

SELECT
  FinalItem,
  MaterialItemCode,
  SUM(Quantity),
  ProductionLead
FROM
  (
    select
      '1' AS Lvl,
      ItemCode as FinalItem,
      ItemCode,
      MaterialItemCode,
      SUM(Qty) AS QUANTITY,
      zEndProduct,
      zSemiFinished,
      zMaterial,
      0 AS ProductionLead
    from
      StdBOM
      INNER join Item on Item.Code = StdBOM.MaterialItemCode
    WHERE
      Qty != 0
    GROUP BY
      ItemCode,
      MaterialItemCode,
      zEndProduct,
      zSemiFinished,
      zMaterial
    UNION ALL
    SELECT
      '2',
      I.ItemCode,
      StdBOM.ItemCode,
      StdBOM.MaterialItemCode,
      Qty,

      zEndProduct,
      zSemiFinished,
      zMaterial,
      ProdBuffTime AS ProductionLead
    FROM
      StdBOM
      INNER join Item on Item.Code = StdBOM.MaterialItemCode
      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = StdBOM.ItemCode
      INNER JOIN (
        select
          ItemCode,
          MaterialItemCode
        from
          StdBOM
          INNER join Item on Item.Code = StdBOM.MaterialItemCode
        WHERE
          Item.zSemiFinished = 1
          and Qty != 0
      ) I ON I.MaterialItemCode = StdBOM.ItemCode
      AND StdBOM.Qty != 0
    UNION ALL
    SELECT
      '3',
      FinalItem,
      BOM.ItemCode,
      BOM.MaterialItemCode,
      BOM.Qty,
      Item.zEndProduct,
      Item.zSemiFinished,
      Item.zMaterial,
      ProdBuffTime + S.ProductionLead AS ProductionLead
    FROM
      (
        SELECT
          I.ItemCode AS FinalItem,
          StdBOM.ItemCode,
          StdBOM.MaterialItemCode,
          Qty,
          zEndProduct,
          zSemiFinished,
          zMaterial,
          ProdBuffTime AS ProductionLead
        FROM
          StdBOM
          INNER join Item on Item.Code = StdBOM.MaterialItemCode
          LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = StdBOM.ItemCode
          INNER JOIN (
            select
              ItemCode,
              MaterialItemCode
            from
              StdBOM
              INNER join Item on Item.Code = StdBOM.MaterialItemCode
            WHERE
              Item.zSemiFinished = 1
              and Qty != 0
          ) I ON I.MaterialItemCode = StdBOM.ItemCode
        WHERE
          zSemiFinished = 1
      ) S
      INNER JOIN StdBOM BOM on S.MaterialItemCode = BOM.ItemCode
      INNER JOIN Item on Item.Code = BOM.MaterialItemCode
      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
    WHERE
      BOM.Qty != 0
    UNION ALL
    SELECT
      '4',
      FinalItem,
      BOM.ItemCode,
      BOM.MaterialItemCode,
      BOM.Qty,
      Item.zEndProduct,
      Item.zSemiFinished,
      Item.zMaterial,
      ProdBuffTime + T.ProductionLead AS ProductionLead
    FROM
      (
        SELECT
          FinalItem,
          BOM.ItemCode,
          BOM.MaterialItemCode,
          BOM.Qty,
          Item.zEndProduct,
          Item.zSemiFinished,
          Item.zMaterial,
          ProdBuffTime + S.ProductionLead AS ProductionLead
        FROM
          (
            SELECT
              I.ItemCode AS FinalItem,
              StdBOM.ItemCode,
              StdBOM.MaterialItemCode,
              Qty,
              zEndProduct,
              zSemiFinished,
              zMaterial,
              ProdBuffTime AS ProductionLead
            FROM
              StdBOM
              INNER join Item on Item.Code = StdBOM.MaterialItemCode
              LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = StdBOM.ItemCode
              INNER JOIN (
                select
                  ItemCode,
                  MaterialItemCode
                from
                  StdBOM
                  INNER join Item on Item.Code = StdBOM.MaterialItemCode
                WHERE
                  Item.zSemiFinished = 1
                  and Qty != 0
              ) I ON I.MaterialItemCode = StdBOM.ItemCode
            WHERE
              zSemiFinished = 1
          ) S
          INNER JOIN StdBOM BOM on S.MaterialItemCode = BOM.ItemCode
          INNER JOIN Item on Item.Code = BOM.MaterialItemCode
          LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
        WHERE
          BOM.Qty != 0
      ) T
      INNER JOIN StdBOM BOM on T.MaterialItemCode = BOM.ItemCode
      INNER JOIN Item on Item.Code = BOM.MaterialItemCode
      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
    WHERE
      BOM.Qty != 0
    UNION ALL
    SELECT
      '5',
      FinalItem,
      BOM.ItemCode,
      BOM.MaterialItemCode,
      BOM.Qty,
      Item.zEndProduct,
      Item.zSemiFinished,
      Item.zMaterial,
      ProdBuffTime + U.ProductionLead AS ProductionLead
    FROM
      (
        SELECT
          FinalItem,
          BOM.ItemCode,
          BOM.MaterialItemCode,
          BOM.Qty,
          Item.zEndProduct,
          Item.zSemiFinished,
          Item.zMaterial,
          ProdBuffTime + T.ProductionLead AS ProductionLead
        FROM
          (
            SELECT
              FinalItem,
              BOM.ItemCode,
              BOM.MaterialItemCode,
              BOM.Qty,
              Item.zEndProduct,
              Item.zSemiFinished,
              Item.zMaterial,
              ProdBuffTime + S.ProductionLead AS ProductionLead
            FROM
              (
                SELECT
                  I.ItemCode AS FinalItem,
                  StdBOM.ItemCode,
                  StdBOM.MaterialItemCode,
                  Qty,
                  zEndProduct,
                  zSemiFinished,
                  zMaterial,
                  ProdBuffTime AS ProductionLead
                FROM
                  StdBOM
                  INNER join Item on Item.Code = StdBOM.MaterialItemCode
                  LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = StdBOM.ItemCode
                  INNER JOIN (
                    select
                      ItemCode,
                      MaterialItemCode
                    from
                      StdBOM
                      INNER join Item on Item.Code = StdBOM.MaterialItemCode
                    WHERE
                      Item.zSemiFinished = 1
                      and Qty != 0
                  ) I ON I.MaterialItemCode = StdBOM.ItemCode
                WHERE
                  zSemiFinished = 1
              ) S
              INNER JOIN StdBOM BOM on S.MaterialItemCode = BOM.ItemCode
              INNER JOIN Item on Item.Code = BOM.MaterialItemCode
              LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
            WHERE
              BOM.Qty != 0
          ) T
          INNER JOIN StdBOM BOM on T.MaterialItemCode = BOM.ItemCode
          INNER JOIN Item on Item.Code = BOM.MaterialItemCode
          LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
        WHERE
          BOM.Qty != 0
      ) U
      INNER JOIN StdBOM BOM on U.MaterialItemCode = BOM.ItemCode
      INNER JOIN Item on Item.Code = BOM.MaterialItemCode
      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
    WHERE
      BOM.Qty != 0
    UNION ALL
    SELECT
      '6',
      FinalItem,
      BOM.ItemCode,
      BOM.MaterialItemCode,
      BOM.Qty,
      Item.zEndProduct,
      Item.zSemiFinished,
      Item.zMaterial,
      ProdBuffTime + Y.ProductionLead AS ProductionLead
    FROM
      (
        SELECT
          FinalItem,
          BOM.ItemCode,
          BOM.MaterialItemCode,
          BOM.Qty,
          Item.zEndProduct,
          Item.zSemiFinished,
          Item.zMaterial,
          ProdBuffTime + U.ProductionLead AS ProductionLead
        FROM
          (
            SELECT
              FinalItem,
              BOM.ItemCode,
              BOM.MaterialItemCode,
              BOM.Qty,
              Item.zEndProduct,
              Item.zSemiFinished,
              Item.zMaterial,
              ProdBuffTime + T.ProductionLead AS ProductionLead
            FROM
              (
                SELECT
                  FinalItem,
                  BOM.ItemCode,
                  BOM.MaterialItemCode,
                  BOM.Qty,
                  Item.zEndProduct,
                  Item.zSemiFinished,
                  Item.zMaterial,
                  ProdBuffTime + S.ProductionLead AS ProductionLead
                FROM
                  (
                    SELECT
                      I.ItemCode AS FinalItem,
                      StdBOM.ItemCode,
                      StdBOM.MaterialItemCode,
                      Qty,
                      zEndProduct,
                      zSemiFinished,
                      zMaterial,
                      ProdBuffTime AS ProductionLead
                    FROM
                      StdBOM
                      INNER join Item on Item.Code = StdBOM.MaterialItemCode
                      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = StdBOM.ItemCode
                      INNER JOIN (
                        select
                          ItemCode,
                          MaterialItemCode
                        from
                          StdBOM
                          INNER join Item on Item.Code = StdBOM.MaterialItemCode
                        WHERE
                          Item.zSemiFinished = 1
                          and Qty != 0
                      ) I ON I.MaterialItemCode = StdBOM.ItemCode
                    WHERE
                      zSemiFinished = 1
                  ) S
                  INNER JOIN StdBOM BOM on S.MaterialItemCode = BOM.ItemCode
                  INNER JOIN Item on Item.Code = BOM.MaterialItemCode
                  LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
                WHERE
                  BOM.Qty != 0
              ) T
              INNER JOIN StdBOM BOM on T.MaterialItemCode = BOM.ItemCode
              INNER JOIN Item on Item.Code = BOM.MaterialItemCode
              LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
            WHERE
              BOM.Qty != 0
          ) U
          INNER JOIN StdBOM BOM on U.MaterialItemCode = BOM.ItemCode
          INNER JOIN Item on Item.Code = BOM.MaterialItemCode
          LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
        WHERE
          BOM.Qty != 0
      ) Y
      INNER JOIN StdBOM BOM on Y.MaterialItemCode = BOM.ItemCode
      INNER JOIN Item on Item.Code = BOM.MaterialItemCode
      LEFT OUTER JOIN ProductionLead on ProductionLead.ItemCode = BOM.ItemCode
    WHERE
      BOM.Qty != 0
  ) BOM
WHERE
  zMATERIAL = 1
GROUP BY
  MaterialItemCode,
  ProductionLead,
  FinalItem
ORDER BY
  1,
  2

表格和样本数据：

CREATE TABLE ProductionLead (
    ItemCode varchar(40) NULL, --This Includes Half-Finished Products
    ProdBuffTime float(53) NULL
)

CREATE TABLE StdBOM(
    ItemCode varchar(40) NULL, --BOTH Finished and Half-Finished Products
    MaterialItemCode varchar(80) NULL, --BOTH Half-Finished and Materials
    Qty real NULL
)

CREATE TABLE Item(
    Code nvarchar(450) NULL, --Materials, Half-Finished and Finished
    zEndProduct bit NULL,
    zMaterial bit NULL,
    zSemiFinished bit NULL
)

--SAMPLE DATA

INSERT INTO ITEM (Code, zEndProduct, zSemiFinished, zMaterial) VALUES
('51130',1,0,0),
('905111', 0, 1, 0),
('91010', 0, 0, 1),
('99400', 0, 0, 1),
('t81400', 0, 0, 1),
('t82002', 0, 0, 1),
('t82215', 0, 0, 1),
('t85062', 0, 0, 1),
('t85102', 0, 0, 1),
('904111', 0, 1, 0),
('91010', 0, 0, 1),
('t84100', 0, 0, 1),
('902100', 0, 1, 0),
('920903', 0, 1, 0),
('99405', 0, 0, 1),
('11016', 0, 0, 1),
('79997', 0, 0, 1),
('91001', 0, 0, 1),
('91010', 0, 0, 1),
('99403', 0, 0, 1),
('902160', 0, 0, 1),
('902702', 0, 0, 1),
('902704', 0, 0, 1),
('t80200', 0, 0, 1),
('t82432', 0, 0, 1)

INSERT INTO StdBOM (ItemCode, MaterialItemCode, Qty) VALUES
('920903','91001',0.872),
('920903','t80200',0.128),
('902100','11025',0),
('902100','11024',0),
('902100','11026',0),
('902100','11016',1.413),
('902100','11027',0),
('902100','11011',0),
('904111','902100',0.943),
('904111','902165',0),
('904111','920903',0.057),
('904111','99405',0.0028),
('905111','904111',1.1806),
('905111','t84100',0.006548),
('905111','91010',0.539),
('902100','901100',0),
('902100','99403',0.005),
('904111','901220',0),
('902100','t82432',0.0051),
('902100','79997',0.02),
('902100','91001',0),
('902100','91010',0.058),
('902100','902702',-0.0814),
('902100','902704',-0.0299),
('902100','902160',-0.001),
('904111','91010',0),
('904111','902160',0)

INSERT INTO ProductionLead (ItemCode, ProdBuffTime) VALUES
('905111',1),
('t82002',0),
('t85062',0),
('t81400',0),
('99400',0),
('t84100',0),
('904111',0),
('902100',1),
('99405',0),
('11016',0),
('99403',0),
('t82432',0),
('91001',0),
('79997',0),
('t80200',0),
('t82215',0),
('t85102',0),
('91010',0),
('902160',0),
('902702',0),
('902704',0),
('920903',0),
('11016',0),
('11016',0)

从这些表格和数据中，我希望得到 zMaterial=1 的 Items 的总数。

【问题讨论】：

样本数据最好使用DDL + DML。请edit您的问题包括它，您当前的尝试和您想要的结果。更多详情，read this.

标签： sql loops tsql recursion layer

【解决方案1】：

我想通了。这是代码。

WITH RPL (PART, SUBPART, QUANTITY, ProductionBuffer) AS (
    SELECT StdBOM.itemcode, StdBOM.MatItemCode, Qty, ProductionLead.ProdBuffTime AS ProductionBuffer
    FROM StdBOM
    LEFT OUTER JOIN ProductionLead ON ProductionLead .ItemCode=StdBOM.MatItemCode
    where Qty != 0
    UNION ALL
    SELECT PARENT.PART, CHILD.MatItemCode, PARENT.QUANTITY * CHILD.Qty, PARENT.ProductionBuffer+PRODBUFFMAT.ProdBuffTime
    FROM RPL PARENT, StdBOM CHILD
    JOIN Digia_ItemLoc PRODBUFFMAT ON PRODBUFFMAT.ItemCode=CHILD.MatItemCode
    WHERE PARENT.SUBPART = CHILD.itemCode
)

SELECT PART, SUBPART, Material.zMaterial, SUM(QUANTITY), CASE WHEN ENNAKKO is null THEN 0 ELSE ENNAKKO END AS ENNAKKO FROM RPL
    LEFT OUTER JOIN Item Material ON Material.Code = RPL.SUBPART and Material.zMaterial='Kyllä'
    WHERE zMaterial='Kyllä'
    GROUP BY PART, SUBPART, Material.zMaterial, ENNAKKO
    HAVING SUM(QUANTITY) != 0
    ORDER BY ENNAKKO

【讨论】：