第一步：新建一模块，命名为：module1,将下面的函数复制到模块中：

'求和字段函数
Function ValHecheng(a As Long, b As Long, c As Long) As Long
'首先我们知道a肯定是不会为0的
'如果B为0并且C为0
If b = 0 And c = 0 Then
ValHecheng = a
End If
'如果B不为0且C为0
If b > 0 And c = 0 Then
ValHecheng = a + b
End If
'如果全部不为0
If b > 0 And c > 0 Then
ValHecheng = a + b + c
End If

End Function

'合并字段函数
Function strHecheng(a As Long, b As Long, c As Long) As String
If b = 0 And c = 0 Then
strHecheng = a
End If
If b > 0 And c = 0 Then
strHecheng = a & "+" & b
End If
If b > 0 And c > 0 Then
strHecheng = a & "+" & b & "+" & c
End If
End Function

第二步：新建一查询，应用上面的函数，详见示例。

示   例：

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