计数记录并在不存在的情况下返回零

Question

我需要从表中总计一笔金额。如果没有记录，我的函数必须返回零，但事实并非如此。我得到'#Error'。这是我的功能：

Public Function Fees() As Double

Fees = Nz(DSum("MyFee", "tblDisclosure", "Volunteer = True And Not IsNull(ReceiptsLookup) and RequestDate> DateSerial(Year (Date),Month (Date),1)-1"), 0)

End Function

Answer 1

尝试使用正确的标准字符串：

Public Function Fees() As Double

    Fees = Nz(DSum("MyFee", "tblDisclosure", "Volunteer = True And Not IsNull(ReceiptsLookup) And RequestDate > DateSerial(Year(Date()), Month(Date()), 0)"), 0)

End Function