Question

我需要从订单表中获取所有先前的订单历史记录（最后一个）。问题是客户没有customerId或唯一值。因此，我们获取信息的唯一方法是通过客户电话号码，客户地址，客户名称一起。我编写了以下查询来提取单个订单号的数据，但我需要知道如何使用此查询来提取10,000个客户记录。请帮忙！

SELECT TOP 1 
    O1.*
FROM 
    Orders AS O1
INNER JOIN 
    Orders AS O2 ON  O1.CustAddress = O2.CustAddress
                 AND O1.CustName = O2.CustName
                 AND O1.CustPhone = O2.CustPhone
                 AND O1.OrderDate < O2.OrderDate
WHERE 
    O1.OrderId = '12345'
ORDER BY 
    O1.OrderDate DESC

Answer 1

您可以使用ROW_NUMBER和CTE：

WITH CTE AS
(
     SELECT O1.*, RN = ROW_NUMBER ()  OVER (
                           PARTITION BY CustAddress, CustName, CustPhone 
                           ORDER BY OrderDate DESC )
     FROM Orders AS O1
     WHERE O1.OrderId = '12345'
)
SELECT * FROM CTE WHERE RN = 1

每个CustAddress, CustName, CustPhone - 组返回一行，最新的。

如何获得所有客户的最后一条记录 - SQL Server 2008

1 个答案: