Removing Duplicate Rows

by Allen Wyatt
(last updated September 15, 2018)

5

When you are working with a large data table, it is not uncommon for the table to contain what is essentially duplicate information. To process the information in the table, you may want to remove any of the rows you consider duplicate, thereby paring down the amount of information you need to process.

For instance, let's say that the first cell of each row contains a part number. What if you want to delete any rows that have duplicate part numbers in the first cell? If you need this solution, the following macro is for you:

Sub DelDupRows()
    Dim rngSrc As Range
    Dim NumRows As Integer
    Dim ThisRow As Integer
    Dim ThatRow As Integer
    Dim ThisCol As Integer
    Dim RightCol As Integer
    Dim J As Integer, K As Integer

    Application.ScreenUpdating = False
    Set rngSrc = ActiveSheet.Range(ActiveWindow.Selection.Address)

    NumRows = rngSrc.Rows.Count
    ThisRow = rngSrc.Row
    ThatRow = ThisRow + NumRows - 1
    ThisCol = rngSrc.Column
    RightCol = ThisCol + rngSrc.Columns.Count - 1

    'Start wiping out duplicates
    For J = ThisRow To (ThatRow - 1)
        If Cells(J, ThisCol) > "" Then
            For K = (J + 1) To ThatRow
                If Cells(J, ThisCol) = Cells(K, ThisCol) Then
                    Cells(K, ThisCol) = ""
                End If
            Next K
        End If
    Next J

    'Remove rows with empty key cells
    For J = ThatRow To ThisRow Step -1
        If Cells(J, ThisCol) = "" Then
            Range(Cells(J, ThisCol), _
              Cells(J, RightCol)).Delete xlShiftUp
        End If
    Next J
    Application.ScreenUpdating = True
End Sub

The macro works on a selection you make before calling it. Thus, if you need to remove duplicate rows from the range D7:G85, simply select that range and then run the macro. It removes the duplicates from the range D7:D85, and then removes all rows in D7:G85 (four columns per row) for which the cell in column D is blank.

Note:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2108) applies to Microsoft Excel 97, 2000, 2002, and 2003.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

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Comments

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What is three more than 1?

2018-10-03 12:22:47

Willy Vanhaelen

@Michael
Whether you do the Y loop top to borttom or reverse doesn't matter.

@Barry
You probably didn't test the macro because then you would have found it working quite well. In the figure herafter I explain how it works. There is even a possibility to increase the speed: simply insert "Exit For" just before the "End If" line. When the Y loop deletes a duplicate the row bolow takes its place but that has already been tested so it has no sence to continue the loop.
(see Figure 1 below)

Figure 1. 


2018-09-24 03:46:34

Michael (Micky) Avidan

@Barry,
Try:
-----------------------------
For Y = X-1 To 1 Strp -1
-----------------------------
Micky


2018-09-23 07:17:56

Barry

@Willy

I think this has a bug in it. When you delete the row everything below moves up 1 row but Y doesn't adjust also so as it stands the new row Y will not be tested as a possible duplicate. It gets interesting if X is greater than Y when a row is deleted.

The code also deems a duplicate if the first column is the same even if other columns i the row are different. This may be acceptable in some circumstances but is depends on the applications definition of what is a duplicate.


2018-09-22 14:06:54

Willy Vanhaelen

You don't need three loops. In the second loop you can delete the duplicate row at once.

Here is a drastically simplified macro that does the job as well:

Sub DelDupRows()
Dim X As Long, Y As Long
Application.ScreenUpdating = False
With Selection
For X = .Rows.Count To 1 Step -1
For Y = 1 To X - 1
If .Cells(X, 1) = .Cells(Y, 1) Then
.Range(Cells(X, 1), Cells(X, .Columns.Count)).Delete xlShiftUp
End If
Next Y
Next X
End With
Application.ScreenUpdating = True
End Sub


2018-09-21 06:12:50

Thomas Papavasiliou

Thanks for your tips. An option for keeping the first or last matching data may be quite useful


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