Highlighting duplicates accross a workbook

[Babydum]

Hi,

i've searched the forum re finding duplicates across many sheets. Column B on each sheet contains customer reference numbers. I need a formula on each line in column A (or a macro to do this) that will return "Dup" if that reference number appears anywhere else on that sheet or in the workbook. "Dup" would need to occur on all instances where there is duplicate (e.g, if there are two occurences of "QWERTY01", both will show a "Dup")

Sheets are imported on a daily basis, so the workbook is growing. That's why I'm thinking maybe code would be better, so that I can run whenever I need to check.

Thanks for any advice

 

[Nimrod]

Public Sub MarkDupes()
Dim WS As Worksheet

For Each WS In Worksheets
    For Rw = 1 To WS.Cells(65536, 2).End(xlUp).Row
        With WS.Cells(Rw, 2)
            If Len(Trim(.Value)) > 0 Then
                If IsDupe(.Value) Then
                    .Offset(0, -1).Value = "Dup"
                End If
            End If
        End With
    Next Rw
Next WS
End Sub

Public Function IsDupe(SrcValue) As Boolean
For Each WS In Worksheets
    If WorksheetFunction.CountIf(WS.Columns("B:B"), SrcValue) > 1 Then
        IsDupe = True
        Exit Function
    End If
Next WS
    IsDupe = False
End Function

 

[Babydum]

Thanks Nimrod,

This code doesn't appear to do anything. I run XL97, don't know if that is a factor.

I made a dummy s/sheet where I put duplicate entries in sheets 1 & 2, but nothing wasreturned in Column A.

Any thoughts?

 

[Nimrod]

Sorry, Babydum , first version would only mark dupes if found on same sheet. I misread what you wanted ... try this one :wink:

Public Sub MarkDupes()
Dim WS As Worksheet

For Each WS In Worksheets
    For Rw = 1 To WS.Cells(65536, 2).End(xlUp).Row
        With WS.Cells(Rw, 2)
            If Len(Trim(.Value)) > 0 Then
                If IsDupe(.Value) Then
                    .Offset(0, -1).Value = "Dup"
                End If
            End If
        End With
    Next Rw
Next WS
End Sub

Public Function IsDupe(SrcValue) As Boolean
Dim DupCnt As Integer
DupCnt = 0
For Each WS In Worksheets
    If WorksheetFunction.CountIf(WS.Columns("B:B"), SrcValue) > 0 Then
        DupCnt = DupCnt + 1
        If DupCnt > 1 Then
            IsDupe = True
            Exit Function
        End If
    End If
Next WS
    IsDupe = False
End Function

 

[Zack Barresse]

Babydum, how about brettdj's Duplicate Master? It does this super fast, and quite wonderfully ..

http://members.iinet.net.au/~brettdj/

 

[Babydum]

Nimrod: Thanks for this, but unfortunately, it still doesn't seem to be working - the egg-timer's on, but it doesn't return "Dup". Sorry. The duplicates column is actually C:C, but i adjusted that in the code as well as changing offset from -1 to -2 (dup still needs to be in A:A), perhaps I did something wrong?

Firefytr: Unfortunately this add-in is for XL2000 and above, but the program needs to be able to be run on some 97 equipped machines.

Thanks both for your help.

 

[Nimrod]

Public Sub MarkDupes()
Dim WS As Worksheet
Dim SrcCol As Integer

' MAKE COLUMN CHANGES HERE !!!
SrcCol = 3
TargCol = 1

For Each WS In Worksheets
    For Rw = 1 To WS.Cells(65536, SrcCol).End(xlUp).Row
        With WS.Cells(Rw, SrcCol)
            If Len(Trim(.Value)) > 0 Then
                If IsDupe(.Value, SrcCol) Then
                    WS.Cells(Rw, TargCol).Value = "Dupe"
                End If
            End If
        End With
    Next Rw
Next WS
End Sub

Public Function IsDupe(SrcValue, Src) As Boolean
Dim DupCnt As Integer
DupCnt = 0
For Each WS In Worksheets
    If WorksheetFunction.CountIf(WS.Cells(1, Src).EntireColumn, SrcValue) > 0 Then
        DupCnt = DupCnt + 1
        If DupCnt > 1 Then
            IsDupe = True
            Exit Function
        End If
    End If
Next WS
    IsDupe = False
End Function

 

[Babydum]

Nimrod,

Thanks very much for this!