如何转换UPDATE外部适用于Update Left Join？

Question

I am running this query on sql 2008 but my client need this to run on sql 2000. can someone help me convert this query to sql 2000?

Update cust set Balance = dv.balance 
From (SELECT hb.Balance,dv.custnum FROM [#custnumtbl] as dv 
OUTER APPLY (SELECT TOP 1 Balance,custnum FROM CLedger b 
WHERE b.CustNum = dv.custnum ORDER BY Pdate DESC) as hb) as dv 
where cust.CustNum = dv.custnum

Answer 1

I'm pretty sure this is equivalent to the following correlated subquery:

Update cust
    set Balance = (SELECT TOP 1 cl.Balance
                   FROM [#custnumtbl] dv JOIN
                        Cledger b
                        ON b.CustNum = dv.custnum
                   WHERE dv.custnum = cust.CustNum
                   ORDER BY Pdate DESC
                  );

Answer 2

SQL2000 does not support ORDER inside the view

UPDATE cust SET Balance = cl.Balance
FROM 
    cust 
    INNER JOIN [#custnumtbl] tmp ON cust.CustNum = tmp.CustNum
    LEFT OUTER JOIN CLedger cl ON 
        cl.CustNum = cust.CustNum 
        AND PDate = (SELECT MAX(PDate) FROM CLedger WHERE CustNum = cl.CustNum)