SQL查询结果问题

查询用于获取某个客户端的余额

SELECT  t.[InvoiceID], t.S_Type as Type,
        t.Date, t.Debit, t.Credit, b.Balance
FROM Statement as t CROSS apply
     (SELECT Balance = SUM(Debit) - SUM(Credit)
      FROM Statement as x
      WHERE (x.date < t.date or
             x.date = t.date 
            ) AND
            x.InvoiceID = t.InvoiceID 
            AND x.CustID = t.CustID
     ) b
WHERE t.CustID ='2' and date between '2015-01-01' and '2016-01-12'
order by InvoiceID, Type desc, Date

该问题与销售发票有关#13 20 176其应与发票借方合计并显示余额

所以正确的输出应该是这样的

   InvoiceID    Type                Date    Debit   Credit  Balance
    4          Sales Invoice    2015-06-09  520.00  0.00    520.00
    4          Receipt Voucher  2016-01-04  0.00    520.00  0.00
    6          Sales Invoice    2015-06-09  160.00  0.00    160.00
    6          Receipt Voucher  2016-01-04  0.00    160.00  0.00
    9          Sales Invoice    2015-06-09  850.00  0.00    850.00
    9          Receipt Voucher  2016-01-04  0.00    850.00  0.00
    13         Sales Invoice    2015-06-09  200.00  0.00    200.00
    20         Sales Invoice    2015-07-11  1225.00 0.00    1425.00
    176        Sales Invoice    2015-12-14  900.00  0.00    2325.00

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我认为子查询中的逻辑有点不正确

SELECT  t.[InvoiceID], t.S_Type as Type,
        t.Date, t.Debit, t.Credit, b.Balance
FROM Statement as t CROSS apply
     (SELECT Balance = SUM(Debit) - SUM(Credit)
      FROM Statement as x
      WHERE x.CustID = t.CustID AND
            (x.date < t.date or
             x.date = t.date AND x.InvoiceID <= t.InvoiceID
            ) 
     ) b
WHERE t.CustID ='2' and
      date between '2015-01-01' and '2016-01-12'
ORDER BY InvoiceID, Type desc, Date;

或者，如果

借方

和

贷方

可能具有

空值

值：

sum(coalesce(debit, 0) - coalesce(credit, 0)) over (partition by custid order by date, invoiceid)

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这3张唱片有什么特别之处？为什么它们求和而没有其他条件？您的问题是，在子查询中，您的条件之一是x.invoiceid=t.invoiceid，因此，不同的发票ID除了自身之外不能加任何值。因此，我可以做的是，但现在余额不包含收据凭证值。此代码中的任何内容都不会像原始查询中那样处理借项和贷项。这只是重新安排了子查询where子句中的布尔表达式。因此，您能否帮助我进行另一个查询，以获得我在问题中提到的输出，谢谢

sum(debit - credit) over (partition by custid order by date, invoiceid)

sum(coalesce(debit, 0) - coalesce(credit, 0)) over (partition by custid order by date, invoiceid)