在Sql Server 2008中，如何为每个客户计算发货数量

Question

我有两张表：客户------>>发货

我想为每个客户的每批发货提供一个唯一的编号，例如

CustomerID      ShipmentID       ShipmnetNumber
    10              50                  1
    10              51                  2
    10              55                  3

    15              56                  1
    15              57                  2
    15              58                  3

    17              59                  1
    17              60                  2

等...

我如何在 sql server 2008 中做到这一点

Answer 1

要通过查询获取编号，您可以执行此操作

select CustomerID,
       ShipmentID,
       row_number() over(partition by Shipment.CustomerID  
                         order by ShipmentID) as ShipmentNumber
from Shipment

如果您想使用 ShipmentNumber（新添加的列）更新表，您可以执行此操作

;with S as
(
  select ShipmentNumber,
         row_number() over(partition by Shipment.CustomerID  
                           order by ShipmentID) as ShipNum
  from Shipment
)
update S
set ShipmentNumber = ShipNum