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Dsum problem

Posted on 2000-04-27
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Last Modified: 2012-06-27
I'm creating a membership database and have problem about Dsum function. Well, i'm in the client form, but wanna know how much each client's paid so far. When i looked at the Sample Db from MSAccess ( Named Membership), i can use Dsum to get the sum from another table. This is the code from the sample
"=IIf(IsNull([MemberID]),0,DSum("[PaymentAmount]","Payments","[MemberID]=" & [MemberID]))"

So, i copied the code and paste it to my form, and changed from the [MemberID] to be [CaseID]. I also have "Payment" table, and "paymentAmount" field, The relationship is one to many. Unfortunately, i got the #error. Do u have any idea?

 
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Question by:TerryOh
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Expert Comment

by:bknouse
ID: 2755831
Try changing the name attribute of the control on the form (you find this in the properties OTHER tab).  If you originally had this named, Access gets confused and displays the #error instead of the value.

Brent
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Expert Comment

by:JCE
ID: 2755851
If MemberId is a integer then I think your code should be like this.
=IIf(IsNull([MemberID]),0,DSum("[PaymentAmount]","Payments","[MemberID]=" & [MemberID] & ""))

If MemberId is text then it should be like this.
=IIf(IsNull([MemberID]),0,DSum("[PaymentAmount]","Payments","[MemberID]='" & [MemberID] & "'"))
Good luck
JCE
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Author Comment

by:TerryOh
ID: 2756091
JCE, My MemberID is Texe, but when I tried the code that u told me, i got Blank field instead of #error. Why?
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Expert Comment

by:paasky
ID: 2756399
Hello TerryOh,

You should add quotes or double quotes to criteria if you're comparing string (text) type fields:

=IIf(IsNull([MemberID]),0,DSum("[PaymentAmount]","Payments","[MemberID]='" & [MemberID] & "'"))

or

=IIf(IsNull([MemberID]),0,DSum("[PaymentAmount]","Payments","[MemberID]=" & Chr(34) & [MemberID] & Chr(34)))

chr(34) = "

Hope this helps,
Paasky

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Accepted Solution

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JCE earned 20 total points
ID: 2756414
Try this first
=DSum("[PaymentAmount]","Payments","[MemberID]='" & [MemberID] & "'")
and next
=DSum("[PaymentAmount]","Payments","[MemberID]='abc'")
abc is your MemberID.
Let me know if it works.
JCE

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Expert Comment

by:paasky
ID: 2756418
Oh oh! Sorry JCE, my intention was not to step on your toes.

Paasky
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Expert Comment

by:paasky
ID: 2756467
Hmm.. I think the Iif is not necessary needed here, try this instead:

=DSum("[PaymentAmount]","Payments","[MemberID]='" & NZ([MemberID],"####") & "'")

Paasky



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Author Comment

by:TerryOh
ID: 2756927
Hey, JCE, it works!!!!!

Thank you!!

JCE, paasky, and bknouse
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