Microsoft KB Archive/139882

= How to Compare Data in Two Columns for Duplicates =

Article ID: 139882

Article Last Modified on 10/11/2006

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APPLIES TO


 * Microsoft Excel 97 Standard Edition
 * Microsoft Excel 95 Standard Edition
 * Microsoft Excel 5.0 Standard Edition
 * Microsoft Excel 98 for Macintosh

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This article was previously published under Q139882





SUMMARY
This article describes two methods for comparing two columns of data to find duplicate entries between the two columns.



Method 1: Use a Worksheet Formula
The following steps describe how to use a worksheet formula to compare the data in two columns:   In a new worksheet, enter the following data (leave column B empty):      A1: 1   B1:     C1: 3 A2: 2  B2:     C2: 5 A3: 3  B3:     C3: 8 A4: 4  B4:     C4: 2 A5: 5  B5:     C5: 0  Type the following formula in cell B1:

=IF(ISERROR(MATCH(A1,$C$1:$C$5,0)),"",A1)

 Select cells B1:B5. On the Edit menu, point to Fill, and then click Down.

The duplicate numbers are displayed in column B. The matching numbers will be put next to the first column as illustrated here:   A1: 1   B1:     C1: 3 A2: 2  B2: 2   C2: 5 A3: 3  B3: 3   C3: 8 A4: 4  B4:     C4: 2 A5: 5  B5: 5   C5: 0

Method 2: Use a Visual Basic Macro
Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. The following steps describe how to use a Microsoft Visual Basic for Applications macro (Sub procedure) to compare the data in two columns.   Enter the following code in a module sheet: Sub Find_Matches

Dim CompareRange As Variant, x As Variant, y As Variant

' Set CompareRange equal to the range to which you will ' compare the selection.

Set CompareRange = Range("C1:C5") ' NOTE: If the compare range is located on another workbook ' or worksheet, use the following syntax. ' Set CompareRange = Workbooks("Book2"). _         '   Worksheets("Sheet2").Range("C1:C5") '         ' Loop through each cell in the selection and compare it to          ' each cell in CompareRange.

For Each x In Selection For Each y In CompareRange If x = y Then x.Offset(0, 1) = x             Next y          Next x

End Sub </li>  In a new worksheet, enter the following data (leave column B empty): <pre class="fixed_text">     A1: 1     C1: 3 A2: 2    C2: 5 A3: 3    C3: 8 A4: 4    C4: 2 A5: 5    C5: 0 </li> Select the range A1:A5.</li> On the Tools menu, click Macro, and select the macro "Find_Matches". (In Microsoft Excel 97 or Microsoft Excel 98 Macintosh Edition, click the Tools menu, point to Macro, and click Macros. Then, select the macro "Find_Matches".) Click Run to run the macro.</li></ol>

The duplicate numbers are displayed in column B. The matching numbers will be put next to the first column as illustrated here: <pre class="fixed_text">  A1: 1   B1:     C1: 3 A2: 2  B2: 2   C2: 5 A3: 3  B3: 3   C3: 8 A4: 4  B4:     C4: 2 A5: 5  B5: 5   C5: 0

Additional query words: 8.00 XL98 XL97 XL7 XL5 match data XL

Keywords: kbdtacode kbhowto kbprogramming KB139882

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