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Getting most recent orders?
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01249462
Message ID:
01250731
Vues:
23
>>Try
>>
>>SELECT Customer.CustomerID, Customer.CustName, Orders.OrderID, ;
>>			Orders.OrderDate, Orders.Destination ;
>>	FROM Customer ;
>>		INNER JOIN orders ON Orders.CustomerID = Customer.CustomerID ;
>>	WHERE OrderDate = ( SELECT MAX(OrderDate) FROM Orders o2 WHERE o2.CustomerID = Orders.CustomerID)
>>
>
>Hi Sergey,
>
>This select will return the same result (VFP9 only). I'm wondering which one is better?
>
>SELECT Customer.CustomerID, Customer.CustName, Orders.OrderID, ;
>			Orders.OrderDate, Orders.Destination ;
>	FROM Customer ;
>		INNER JOIN orders ON Orders.CustomerID = Customer.CustomerID ;
>         Inner JOIN (select Max(OrderDate) as Max_Date, CustomerID from Orders group by CustomerID) MaxOrders ;
>on Orders.CustomerID = MaxOrders.CustomerID  and ;
>Orders.OrderDate = MaxOrders.Max_Date
Run tests and tell us.
--sb--
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