Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Deleting Duplicate Columns.

Deleting Duplicate Columns

by Allen Wyatt
(last updated June 21, 2018)

Dror has a worksheet that contains quite a bit of data. It is possible that the data in one column will be exactly the same as the data in another column, so he wonders if there is an easy way to delete any duplicate columns within the worksheet.

The first step, of course, is to figure out if two columns are identical or not. This can be determined rather easily with an array formula such as the following:

=AND(A1:A100=B1:B100)

(Remember that an array formula is entered by using Shift+Ctrl+Enter.) The formula compares all the values in the first 100 rows of columns A and B. If they are all the same, then the formula returns TRUE. If any of the cells don't match, then the formula returns FALSE. If the result is TRUE you could then delete one of the columns because they are the same.

If you want something that is a bit more automatic, meaning that the duplicate column is deleted, then you'll need to use a macro. The following steps through all the columns in the worksheet and, starting with the right-most column, compares all the columns. If any are the same—regardless of their order in the worksheet—then the macro asks if you want the duplicate column deleted.

Sub DeleteDuplicateColumns()
    Dim rngData As Range
    Dim arr1, arr2
    Dim i As Integer, j As Integer, n As Integer

    On Error Resume Next
    Set rngData = ActiveSheet.UsedRange
    If rngData Is Nothing Then Exit Sub

    n = rngData.Columns.Count

    For i = n To 2 Step -1
        For j = i - 1 To 1 Step -1
            If WorksheetFunction.CountA(rngData.Columns(i)) <> 0 And _
              WorksheetFunction.CountA(rngData.Columns(j)) <> 0 Then
                arr1 = rngData.Columns(i)
                arr2 = rngData.Columns(j)
                If AreEqualArr(arr1, arr2) Then
                    With rngData.Columns(j)
                        'mark column to be deleted
                        .Copy
                        If MsgBox("Delete marked column?", vbYesNo) _
                          = vbYes Then
                            rngData.Columns(j).Delete
                        Else
                            'remove mark
                            Application.CutCopyMode = False
                        End If
                    End With
                End If
            End If
        Next j
    Next i

End Sub
Function AreEqualArr(arr1, arr2) As Boolean
    Dim i As Long, n As Long
    AreEqualArr = False
    For n = LBound(arr1) To UBound(arr1)
        If arr1(n, 1) <> arr2(n, 1) Then
            Exit Function
        End If
    Next n
    AreEqualArr = True
End Function

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 (7164) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Deleting Duplicate Columns.

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. ...

MORE FROM ALLEN

Positive and Negative Colors in a Chart

When creating a line cart, the line can show values both positive and negative values. This tip explains how you can use ...

Discover More

Getting Rid of 8-Bit ASCII Characters

When working with data created outside of Excel, you may need to check that data to make sure it contains no unwanted ...

Discover More

Entering Dates in Excel

When you type information into a cell, Excel tries to figure out what type of information you are entering. If Excel can ...

Discover More

Save Time and Supercharge Excel! Automate virtually any routine task and save yourself hours, days, maybe even weeks. Then, learn how to make Excel do things you thought were simply impossible! Mastering advanced Excel macros has never been easier. Check out Excel 2010 VBA and Macros today!

More ExcelTips (menu)

Selecting a Word

There are a few editing tricks you can apply in Excel the same as you do in Word. Selecting a word from the text in a ...

Discover More

Zooming In On Your Worksheet

If you have trouble seeing the information presented in a worksheet, you can use Excel's zooming capabilities to ease the ...

Discover More

Quickly Filling a Column

Excel has a great (and little known) shortcut for filling a column with information. It comes in very handy when you need ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is 9 - 6?

There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)


This Site

Got a version of Excel that uses the menu interface (Excel 97, Excel 2000, Excel 2002, or Excel 2003)? This site is for you! If you use a later version of Excel, visit our ExcelTips site focusing on the ribbon interface.

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.