计算访问中的一个或多个字段答案

【问题标题】：calculated one or more fields in access计算访问中的一个或多个字段
【发布时间】：2016-02-11 17:38:02
【问题描述】：

我创建了如下表

RegID - primary key
Confattid - foreign key
membchoiceid - foreign key and a multivalue field
tourId - foreign key and a multivalue field

其余类似如下查询：

所有付费字段都是货币格式。

我尝试将所有费用字段计算为新字段名称“total”。即使我编写了查询，它也没有显示任何错误，但是当我运行查询时它没有显示结果。

我的查询：

SELECT ConferenceRegisterFee.RegID, 
       ConferenceRegisterFee.ConfStateRegFeePaid, 
       ConferenceRegisterFee.ConfSpouFeePaid, 
       ConferenceRegisterFee.ConfAttMembDuesPaid, 
       ConferenceRegisterFee.ConfLateFeePaid, 
       ConferenceRegisterFee.ConfRegFeePaid, 
       ConferenceRegisterFee.ConfAttMembDuesPaid, 
       [confstateregfeepaid]+[confspoufeepaid]+[confattmembduespaid]+[conflatefeepaid]+[confregfeepaid] AS total
FROM ConferenceRegisterFee
GROUP BY ConferenceRegisterFee.RegID, 
         ConferenceRegisterFee.ConfStateRegFeePaid, 
         ConferenceRegisterFee.ConfSpouFeePaid, 
         ConferenceRegisterFee.ConfAttMembDuesPaid, 
         ConferenceRegisterFee.ConfLateFeePaid, 
         ConferenceRegisterFee.ConfRegFeePaid, 
         ConferenceRegisterFee.ConfAttMembDuesPaid;

我是新手。你们有什么想法可以帮助我度过难关吗？

【问题讨论】：

为什么需要 Group By ，你没有使用任何聚合函数。
“但是当我运行查询时它没有显示结果”它没有显示结果？还是只是没有显示您想要的结果？
非常感谢你们的回复。我将尝试使用 Shakar 告诉我的 sum 函数。 JNevill，查询正在运行，但没有显示我想要的结果。当我今晚运行它时，我会告诉你们。再次感谢。

标签： sql ms-access

【解决方案1】：

非常感谢您的帮助。我已经可以运行查询了，因为我忘记了 NULL 值。

我的查询：选择 ConferenceRegisterFee.RegID, ConferenceRegisterFee.ConfStateRegFeePaid, ConferenceRegisterFee.ConfSpouFeePaid, ConferenceRegisterFee.ConfAttMembDuesPaid, ConferenceRegisterFee.ConfLateFeePaid, ConferenceRegisterFee.ConfRegFeePaid, NZ([ConferenceRegisterFee]![ConfStateRegFeePaid])+NZ([ConferenceRegisterFee]![ConfSpouFeePaid]) ConferenceRegisterFee]![ConfAttMembDuesPaid])+NZ([ConferenceRegisterFee]![ConfLateFeePaid])+NZ([ConferenceRegisterFee]![ConfRegFeePaid]) 总计 FROM ConferenceRegisterFee;

再次感谢

【讨论】：