Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Reject duplicate field with number datatype

Reject duplicate field with number datatype

Reject duplicate field with number datatype

I have a form with some text boxes and one of them is for a Code Number (number datatype). The form also contains an Add New Record button. I’m trying to code the Code Number field to reject any duplicate numbers. Yes, I’m aware that there’s an option in the field table properties that will allow for duplicates and no duplicates. But in this case, I would like to code the Code Number text box on the form to reject duplicate numbers along with a message box. Is this possible?

RE: Reject duplicate field with number datatype

Did you try this reply from the other thread where you asked this question?

You can use something like this for new records. I'm not sure if this is an issue for existing records.

CODE --> vba

Private Sub Code_Number_BeforeUpdate(Cancel As Integer)
    If Form.NewRecord Then
        If Not IsNull(DLookup("code_Number", "County_Rec", "Code_Number=" & Me.Code_Number.Text)) Then
            MsgBox "Duplicate Code Number."
            Cancel = True
        End If
    End If
End Sub 

Hook'D on Access
MS Access MVP

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close