根据数量和目标维度数据将数量拆分为多行

Question

我有一张“主数据”表，我想根据 SQL 服务器中的数量和目标维度数据将数量拆分为多行，如下图示例。

样本数据

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

您可以使用递归 CTE 实现此功能，它将UnitQtyInTag分配给连续的工作表，直到没有剩余数量：

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

我们可以使用日历表方法解决这个问题，我们使用标签中的工作表数量将序列表连接到您的表：

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;

请注意，在实践中，您可能希望用更可扩展的方式替换上面别名为t1的内联子查询，以在 SQL 服务器中生成序列（在 SO 上的其他问题中已经很好地介绍了这一点）。

演示

Answer 3

您可以通过交叉连接来实现，

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