Removing Duplicate Values in Excel with VBA
In this Article
This tutorial will demonstrate how to remove duplicates using the RemoveDuplicates method in VBA.
When data is imported or pasted into an Excel worksheet, it can often contain duplicate values. You may need to clean the incoming data and remove duplicates.
Fortunately, there is an easy method within the Range object of VBA which allows you to do this.
Range(“A1:C8”).RemoveDuplicates Columns:=1, Header:=xlYes
- [Columns] – Specify which columns are checked for duplicate values. All columns much match to be considered a duplicate.
- [Header] – Does data have a header? xlNo (default), xlYes, xlYesNoGuess
Technically, both parameters are optional. However, if you don’t specify the Columns argument, no duplicates will be removed.
The default value for Header is xlNo. Of course it’s better to specify this argument, but if you have a header row, it’s unlikely the header row will match as a duplicate.
RemoveDuplicates Usage Notes
- Before using the RemoveDuplicates method, you must specify a range to be used.
- The RemoveDuplicates method will remove any rows with duplicates found, but will keep the original row with all values.
- The RemoveDuplicates method only works on columns and not on rows, but VBA code can be written to rectify this situation (see later).
Sample Data for VBA Examples
In order to show how the example code works, the following sample data is used:
Remove Duplicate Rows
This code will remove all duplicate rows based only on values in column A:
Sub RemoveDupsEx1() Range(“A1:C8”).RemoveDuplicates Columns:=1, Header:=xlYes End Sub
Notice that we explicitly defined the Range “A1:C8”. Instead you can used the UsedRange. The UsedRange will determine the last used row and column of your data and apply RemoveDuplicates to that entire range:
Sub RemoveDups_UsedRange() ActiveSheet.UsedRange.RemoveDuplicates Columns:=1, Header:=xlYes End Sub
UsedRange is incredibly useful, removing the need for you to explicitly define the range.
After running these code, your worksheet will now look like this:
Notice that because only column A (column 1) was specified, the ‘Apples’ duplicate formerly in row 5 has been removed. However, the Quantity (column 2) is different.
To remove duplicates, comparing multiple columns, we can specify those columns using an Array method.
Remove Duplicates Comparing Multiple Columns
Sub RemoveDups_MultColumns() ActiveSheet.UsedRange.RemoveDuplicates Columns:=Array(1, 2) , Header:=xlYes End Sub
The Array tells VBA to compare the data using both columns 1 and 2 (A and B).
The columns in the array do not have to be in consecutive order.
Sub SimpleExample() ActiveSheet.UsedRange.RemoveDuplicates Columns:=Array(3, 1) , Header:=xlYes End Sub
In this example, columns 1 and 3 are used for the duplicate comparison.
This code example uses all three columns to check for duplicates:
Sub SimpleExample() ActiveSheet.UsedRange.RemoveDuplicates Columns:=Array(1, 2, 3) , Header:=xlYes End Sub
Removing Duplicate Rows from a Table
The RemoveDuplicates can also be applied to an Excel table in exactly the same way. However, the syntax is slightly different.
Sub SimpleExample() ActiveSheet.ListObjects("Table1").DataBodyRange.RemoveDuplicates Columns:=Array(1, 3), _ Header:=xlYes End Sub
This will remove the duplicates in the table based on columns 1 and 3 (A and C). However, it does not tidy up the color formatting of the table, and you will see colored blank rows left behind at the bottom of the table.
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Remove Duplicates From Arrays
If you need to remove duplicate values from an array, of course you can output your array into Excel, use the RemoveDuplicates method, and re-import the array.
However, we also wrote a VBA procedure to remove duplicates from an array.
Removing Duplicates from Rows of Data Using VBA
The RemoveDuplicates method only works on columns of data, but with some ‘out of the box’ thinking, you can create a VBA procedure to deal with rows of data.
Suppose that your data looks like this on your worksheet:
You have the same duplicates as before in columns B and E, but you cannot remove them using the RemoveDuplicates method.
The answer is to use VBA to create an additional worksheet, copy the data into it transposing it into columns, remove the duplicates, and then copy it back transposing it back into rows.
Sub DuplicatesInRows() 'Turn off screen updating and alerts – we want the code to run smoothly without the user seeing ‘what is going on Application.ScreenUpdating = False Application.DisplayAlerts = False 'Add a new worksheet Sheets.Add After:=ActiveSheet 'Call the new worksheet 'CopySheet' ActiveSheet.Name = "CopySheet" 'Copy the data from the original worksheet Sheets("DataInRows").UsedRange.Copy 'Activate the new sheet that has been created Sheets("CopySheet").Activate 'Paste transpose the data so that it is now in columns ActiveSheet.Range("A1").PasteSpecial Paste:=xlPasteAll, Operation:=xlNone, SkipBlanks:= _ False, Transpose:=True 'Remove the duplicates for columns 1 and 3 ActiveSheet.UsedRange.RemoveDuplicates Columns:=Array(1, 3), Header _ :=xlYes 'Clear the data in the original worksheet Sheets("DataInRows").UsedRange.ClearContents 'Copy the columns of data from the new worksheet created Sheets("Copysheet").UsedRange.Copy 'Activate the original sheet Sheets("DataInRows").Activate 'Paste transpose the non-duplicate data ActiveSheet.Range("A1").PasteSpecial Paste:=xlPasteAll, Operation:=xlNone, SkipBlanks:= _ False, Transpose:=True 'Delete the copy sheet - no longer needed Sheets("Copysheet").Delete 'Activate the original sheet Sheets("DataInRows").Activate 'Turn back on screen updating and alerts Application.ScreenUpdating = True Application.DisplayAlerts = True End Sub
This code assumes that the original data in rows is held on a worksheet called ‘DataInRows’
After running the code, your worksheet will look like this:
The ‘Apples’ duplicate in column E has now been removed. The user is back in a clean position, with no extraneous worksheets hanging around, and the whole process has been done smoothly with no screen flickering or warning messages.