Code
USE Northwind
go
SELECT CompanyName,
(SELECT MAX(OrderDate)
FROM Orders
WHERE Customers.CustomerID = Orders.CustomerID) AS 最近一笔订单日期
FROM Customers
ORDER BY CompanyName
USE Northwind
go
SELECT CompanyName, MAX(OrderDate) AS 最近一笔订单日期
FROM Customers
INNER JOIN Orders ON Customers.CustomerID = Orders.CustomerID
GROUP BY CompanyName
ORDER BY CompanyName
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