Question

对于每个仓库，我需要获得每种产品的估计数量。此数量是根据上一个库存中记录的数量计算的，减去自上次库存以来的出货量，加上自上次库存以来的重新供应。

以下是我的实体：

-warehouse
  location
-inventory
  date
-product
  name
-inventory_product
  quantity
  warehouse_id
  product_id
  inventory_id
-resupply
  date
-resupplying
  resupply_id
  product_id
  warehouse_id
  quantity
-shipment
  date
-shipping
  shipment_id
  product_id
  warehouse_id
  quantity

我正在考虑......的一些事情。

select distinctrow product.name, inventory_product.quantity - sum(shipping.quantity) as quantity
from inventory
inner join inventory_product on inventory.id = inventory_product.inventory_id
inner join product on inventory.product_id = product.id
inner join shipping on (inventory_product.warehouse_id = shipping.warehouse_id and inventory_product.product_id = shipping.product_id)
inner join shipment on shipping.shipment_id = shipment.id
where inventory.date <= shipment.date
group by shipping.product_id;

但我看不出如何添加补给部分......

Answer 1

考虑拆分单元级别和聚合级别部分，然后将它们连接在一起以进行最终算术表达。将每个保存为要在其他查询的FROM/JOIN子句中引用的存储查询。

上次库存日期查询 （按product_id汇总）

SELECT i.product_id, Max(n.date) AS MaxInvDate
FROM inventory AS n 
INNER JOIN inventory_product AS i ON n.id = i.inventory_id
GROUP BY i.product_id;

货件总和查询 （在上面的MaxInvDate上和之后总和数量）

SELECT i.product_id, i.quantity AS inv_qty, idt.date AS inv_date, 
       SUM(s.quantity) AS shipment_qty    
FROM ((inventory_product i INNER JOIN inventory idt ON idt.id = i.inventory_id)     
INNER JOIN (shipping s INNER JOIN shipment sdt ON sdt.id = s.shipment_id) 
   ON s.product_id = i.product_id)    
INNER JOIN LastInvDateQ l
   ON l.product_id = i.product_id AND idt.date = l.MaxInvDate    
WHERE sdt.date >= l.MaxInvDate    
GROUP BY i.product_id, i.quantity, idt.date

补给资源总和查询 （在上面的MaxInvDate之后加上数量）

SELECT i.product_id, i.quantity AS inv_qty, idt.date AS inv_date, 
       SUM(r.quantity) AS resupply_qty    
FROM ((inventory_product i INNER JOIN inventory idt ON idt.id = i.inventory_id)     
INNER JOIN (resupplying r INNER JOIN resupply rdt ON rdt.id = r.resupply_id) 
   ON r.product_id = i.product_id)    
INNER JOIN LastInvDateQ l
   ON l.product_id = i.product_id AND idt.date = l.MaxInvDate    
WHERE rdt.date >= l.MaxInvDate    
GROUP BY i.product_id, i.quantity, idt.date

最终查询

SELECT s.product_id, s.inv_date, s.inv_qty, s.shipment_qty, r.resupply_qty, 
       (s.inv_qty - s.shipment_qty + r.resupply_qty) as estimated_qty
FROM ShipQtyAggQ s
INNER JOIN ResupplyQtyAggQ r ON (s.inv_date = r.inv_date) 
AND (s.inv_qty = r.inv_qty) 
AND (s.product_id = r.product_id);

当然，您可以将每个SELECT语句作为派生表嵌套在最终查询中，但可能会变得难以阅读和/或维护。

查询添加收到的产品总和并将已发货产品的总和减去库存

1 个答案: