存货账龄报告 (FIFO)

Question

有一个问题需要在 SQL Server 中解决，以使用基于 SKU 和仓库的 FIFO 生成库存老化报告。我已在此处附加架构。

SKU	TransactionType	WarehouseCode	TransactionDate	Qty
100	IN	WH1	2021-04-30	100
100	IN	WH2	2021-04-30	50
101	IN	WH1	2021-04-30	30
101	IN	WH2	2021-05-01	25
100	OUT	WH2	2021-05-02	30
100	OUT	WH1	2021-05-02	20
100	OUT	WH1	2021-05-04	50
100	OUT	WH2	2021-05-04	20
100	OUT	WH1	2021-05-05	25
100	IN	WH2	2021-05-10	30
100	IN	WH1	2021-05-11	30
101	OUT	WH2	2021-05-12	20
100	OUT	WH1	2021-05-15	30

基于上述schema结构，我需要开发一个基于先进先出（FIFO）的库存账龄报告，并显示每个SKU和仓库组合的剩余数量，并使之前的进货记录剩余数量为零。

预期的报告格式假设报告在 (2021-05-20) 运行

SKU	TransactionType	WarehouseCode	TransactionDate	Qty	Remaining	Aging
100	IN	WH1	2021-04-30	100	0	21
100	IN	WH2	2021-04-30	50	0	21
101	IN	WH1	2021-04-30	30	30	21
101	IN	WH2	2021-05-01	25	5	20
100	IN	WH2	2021-05-10	30	30	11
100	IN	WH1	2021-05-11	50	5	10

提前致谢。

Answer 1

您可以使用窗口函数对一段时间内的IN 记录求和（累积总和），并找出最终总数OUT。

那么，如果in_so_far 小于final_out，你就知道你已经使用了该行的所有内容。

aging 似乎只是一个 datediff() 针对一个常量值？

WITH
  cumulative AS
(
  SELECT
    *,
    SUM(CASE WHEN TransactionType = 'IN' THEN Qty ELSE 0 END)
      OVER (
        PARTITION BY SKU, WarehouseCode
            ORDER BY TransactionDate
      )
        AS qty_in_so_far,
    SUM(CASE WHEN TransactionType = 'OUT' THEN Qty ELSE 0 END)
      OVER (
        PARTITION BY SKU, WarehouseCode
      )
        AS qty_out_final
  FROM
    inventory
)
SELECT
  *,
  CASE
    WHEN qty_out_final > qty_in_so_far
      THEN 0
    WHEN qty_in_so_far - qty_out_final > qty
      THEN qty
      ELSE qty_in_so_far - qty_out_final
  END
    AS qty_final,
  DATEDIFF(day, TransactionDate, '2021-05-20') + 1             AS aging
FROM
  cumulative
WHERE
  TransactionType = 'IN'
ORDER BY
  TransactionDate,
  SKU,
  WarehouseCode

演示...https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=b6725edd625001cd874bdb8f37283763