访问2013查询错误

Question

我正在尝试运行我认为是一个非常基本的查询。我只是想根据总计计算收到的付款数量。但是，当我构建表达式并尝试运行查询时，我收到错误消息：

  

您的查询不包含指定的表达式＆＃39; Client_ID＆＃39;作为集合函数的一部分。

我已经阅读了几个关于此错误的问题，但我无法弄清楚我的查询中缺少的是什么，这导致了同样的错误。这是我的疑问：

SELECT Client.Client_Id, Loan.Loan_Id, ([Loan]![BalanceForward]+Sum([Payment]![Amount]))/[Loan]![PaymentAmount] AS [Payment Number]
FROM (Client LEFT JOIN Loan ON Client.Client_Id = Loan.Client_Id) LEFT JOIN Payment ON Loan.Loan_Id = Payment.Loan_Id
WHERE (((Client.Client_Id)=6));

Answer 1

简单地说，您错过了GROUP BY条款。在用于汇总记录集的聚合SQL查询中，必须在Sum(), Count(), Avg(), Var(), Min(), Max()中引用未与GROUP BY聚合的任何字段。基本上，它意味着您正在对记录进行求和或计数，并按此类字段（此处为客户和贷款ID）进行分组。

SELECT Client.Client_Id, Loan.Loan_Id, 
    ([Loan]![BalanceForward] +
    DSum("Amount", "Payment", "Loan_Id=" & Payment.Loan_Id))/
    [Loan]![PaymentAmount] AS [Payment Number]
FROM (Client LEFT JOIN Loan ON Client.Client_Id = Loan.Client_Id) 
LEFT JOIN Payment ON Loan.Loan_Id = Payment.Loan_Id
WHERE (((Client.Client_Id)=6))
GROUP BY Client.Client_Id, Loan.Loan_Id,
        ([Loan]![BalanceForward] +
        DSum("Amount", "Payment", "Loan_Id=" & Payment.Loan_Id))/
        [Loan]![PaymentAmount];

但是，您无法将级别字段（即Loan！BalanceForward，Loan！PaymentAmount）与聚合字段（即Payment！Amount）组合在同一表达式中。因此，您必须使用Domain Aggregates（DSum，DLookUp，DAvg，DCount等）。或者，可以使用subqueries重写这些相同的函数。