根據數量和目標維度數據將數量拆分為多行

Question

我有一張“主數據”表，我想根據 SQL 服務器中的數量和目標維度數據將數量拆分為多行，如下圖示例。

樣本數據

CREATE TABLE MasterData
(
    JobNo  VARCHAR(4),
    Batch  VARCHAR(4),
    Tag  VARCHAR(4),
    UnitQtyInTag INT,
    UnitQtyInSheet INT,
    SheetQtyInTag INT
)


INSERT INTO MasterData
SELECT 'AAAA','B001','1',384,48,8

INSERT INTO MasterData
SELECT 'BBBB','B002','2',300,48,7

Answer 1

您可以使用遞歸 CTE 實現此功能，它將UnitQtyInTag分配給連續的工作表，直到沒有剩余數量：

WITH sheets AS (
  SELECT JobNo,
         Batch,
         Tag,
         UnitQtyInTag,
         UnitQtyInSheet,
         SheetQtyInTag,
         1 AS SheetNumber,
         CASE WHEN UnitQtyInSheet > UnitQtyInTag THEN UnitQtyInTag
              ELSE UnitQtyInSheet 
         END AS pcsinSheet,
         CASE WHEN UnitQtyInSheet > UnitQtyInTag THEN 0
              ELSE UnitQtyInTag - UnitQtyInSheet 
         END AS balance
  FROM MasterData
  UNION ALL
  SELECT JobNo,
         Batch,
         Tag,
         UnitQtyInTag,
         UnitQtyInSheet,
         SheetQtyInTag,
         SheetNumber + 1,
         CASE WHEN UnitQtyInSheet > balance THEN balance
              ELSE UnitQtyInSheet 
         END,
         CASE WHEN UnitQtyInSheet > balance THEN 0
              ELSE balance - UnitQtyInSheet 
         END AS balance
  FROM sheets
  WHERE balance > 0
)
SELECT JobNo, Batch, Tag, UnitQtyInTag, UnitQtyInSheet, SheetQtyInTag, SheetNumber, pcsinSheet
FROM sheets
ORDER BY JobNo, Batch, Tag, SheetNumber

Output：

JobNo   Batch   Tag     UnitQtyInTag    UnitQtyInSheet  SheetQtyInTag   SheetNumber     pcsinSheet
AAAA    B001    1       384             48              8               1               48
AAAA    B001    1       384             48              8               2               48
AAAA    B001    1       384             48              8               3               48
AAAA    B001    1       384             48              8               4               48
AAAA    B001    1       384             48              8               5               48
AAAA    B001    1       384             48              8               6               48
AAAA    B001    1       384             48              8               7               48
AAAA    B001    1       384             48              8               8               48
BBBB    B002    2       300             48              7               1               48
BBBB    B002    2       300             48              7               2               48
BBBB    B002    2       300             48              7               3               48
BBBB    B002    2       300             48              7               4               48
BBBB    B002    2       300             48              7               5               48
BBBB    B002    2       300             48              7               6               48
BBBB    B002    2       300             48              7               7               12

dbfiddle 上的演示

Answer 2

我們可以使用日歷表方法解決這個問題，我們使用標簽中的工作表數量將序列表連接到您的表：

SELECT
    t2.JobNo,
    t2.Batch,
    t2.Tag,
    t2.UnitQtyInTag,
    t2.UnitQtyInSheet,
    t2.SheetQtyInTag,
    t1.num AS SheetNumber
FROM
(
    SELECT 1 AS num UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4
    UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8
) t1
INNER JOIN yourTable t2
    ON t1.num <= t2.SheetQtyInTag
ORDER BY
    t2.JobNo,
    t2.Batch,
    t2.Tag,
    t1.num;

請注意，在實踐中，您可能希望用更可擴展的方式替換上面別名為t1的內聯子查詢，以在 SQL 服務器中生成序列（在 SO 上的其他問題中已經很好地介紹了這一點）。

演示

Answer 3

您可以通過交叉連接來實現，

select m1.* from MasterData m1
cross join MasterData m2;