hi,
I have got a table which has an Items column which is the (auto number) primary key. I want to create a validation rule for the Issues table in such a way so that when the user enter a data for the Issues column, he will be only able to add distinct issues under the same ID column. In other words, Issues can repeat in different IDs but can't repeat under the same ID. How can I set up such a validation rule for Issues column in the table?
table
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You can create a compound Index on those two fields. See attached image.
Note that you set the Unique property to Yes.
mx
Compound Index
"also while the user enters the data through a form, this message error message will show up right in case the values are duplicate?"
Yes. The error will be 3022. Again, if you like, you can trap this error in the Form Error event ... which allows you mainly to create a more 'user friendly' error message.
mx
Hi MX,
by form error,
you mean here in the image? I dont see the form error event.
form error?
Hi
MX,
I did as you told and typed "No duplicate values" under On Error in the form properties but its givnig a error. Did I filled the box in a wrong way or something?
On Error form
error box
Well, that's not exactly how you do it. You need to put some code 'behind' that Event.
Remove what you have now, then click back into the On Error line.
From the drop down list on the right, select [Event Procedure]
Then click on the ellipsis to the right of the drop down button (the 3 dots). Then you will see:
Private Sub Form_Error(DataErr As Integer, Response As Integer)
End Sub
Insert this code between those two lines which will end up looking like:
Private Sub Form_Error(DataErr As Integer, Response As Integer)
Response = acDataErrContinue
If DataErr = 3022 Then
MsgBox "Cannot have duplicates of ID and Issues"
Else
MsgBox "Unexpected error occurred: " & Err.Number & " " & Err.Description
End If
End Sub
mx
Business Accounts
Answer for Membership
by: RaynePosted on 2009-08-09 at 15:26:01ID: 25056225
for example, its ok to have r3 under s1 and s2 But there cant be two r3 for s1 itself.