Question

 SELECT OrderNumber, FIRST(ShippingName) as ShippingName FROM Orders
 GROUP BY OrderNumber

This gives an error, how would I do this?

Answer 1

The FIRST function is not supported in SQL Server.

Maybe you want

SELECT OrderNumber, MIN(ShippingName) as ShippingName
FROM Orders
GROUP BY OrderNumber

But, probably not. Instead I suspect you mean… for each OrderNumber, of all the rows with that OrderNumber, select the ShippingName of the first row according to some ordering.

SELECT OrderNumber,
    (
        SELECT TOP 1 ShippingName
        FROM Orders AS OrdersInner
        WHERE OrdersInner.OrderNumber = Orders.OrderNumber
        ORDER BY OrdersInner.OrderDate, OrdersInner.OrderId
    ) as ShippingName
FROM Orders
GROUP BY OrderNumber

But I’m making some assumptions about both your requirements and your database structure.