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Please,correct my mistake in query

Posted By:      Posted Date: October 20, 2010    Points: 0   Category :Sql Server
I work with SQL Server 2008. I have a table Orders (orderid, orderdate, custid, empid).  I need write a query that calculates a row number for each order based on orderdate, orderid ordering. I should do it using derived table. My leader saus that query isn't correct:
select * from
	SELECT orderid, orderdate, custid, empid,
			  ROW_NUMBER() OVER (PARTITION BY orderdate ORDER BY orderid) rownum
	FROM [TestSQL].[Sales].[Orders]
) DerTable
How should I write it?

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