Sql 如何将更新外部应用转换为更新左连接？

我正在sql 2008上运行此查询，但我的客户端需要在sql 2000上运行此查询。 有人能帮我把这个查询转换成sql 2000吗

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

---

我很确定这相当于以下相关子查询：

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
                  );

---

我很确定这相当于以下相关子查询：

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
                  );

---

SQL2000不支持视图内部的

顺序

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)

---

SQL2000不支持视图内部的

顺序

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)