Extract a list of duplicates from three columns combined
The following regular formula extracts duplicate values from column B (List1), D (List2) and F (List3) combined, the result is displayed in cell H3 and cells below.
Formula in cell H3:
Explaining formula in cell F3
This formula consists of three similar parts, one returns values from List1 and the second returns values from List2 and the third returns duplicates from List3.
IFERROR(IFERROR(formula1, formula2), formula3)
Step 1 - Prevent duplicate values in output
The COUNTIF function counts values based on a condition, in this case, I am counting values in cells above. This makes sure that duplicates are not returned.
COUNTIF($H$2:H2,$B$3:$B$21)=0
becomes
COUNTIF("Duplicates",$B$3:$B$21)=0
becomes
COUNTIF("Duplicates",{"Federer, Roger ";"Djokovic, Novak ";"Murray, Andy ";"Davydenko, Nikolay ";"Roddick, Andy ";"Del Potro, Juan Martin ";"Federer, Roger ";"Davydenko, Nikolay ";"Verdasco, Fernando ";"Gonzalez, Fernando ";"Wawrinka, Stanislas ";"Gonzalez, Fernando ";"Blake, James ";"Nalbandian, David ";"Robredo, Tommy ";"Wawrinka, Stanislas ";"Cilic, Marin ";"Stepanek, Radek ";"Almagro, Nicolas "})=0
{0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0}=0
and returns
{TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE}
Step 2 - Count values in List1
We want to know where the duplicates are in List1.
COUNTIF($B$3:$B$21,$B$3:$B$21)>1
becomes
COUNTIF({"Federer, Roger ";"Djokovic, Novak ";"Murray, Andy ";"Davydenko, Nikolay ";"Roddick, Andy ";"Del Potro, Juan Martin ";"Federer, Roger ";"Davydenko, Nikolay ";"Verdasco, Fernando ";"Gonzalez, Fernando ";"Wawrinka, Stanislas ";"Gonzalez, Fernando ";"Blake, James ";"Nalbandian, David ";"Robredo, Tommy ";"Wawrinka, Stanislas ";"Cilic, Marin ";"Stepanek, Radek ";"Almagro, Nicolas "},{"Federer, Roger ";"Djokovic, Novak ";"Murray, Andy ";"Davydenko, Nikolay ";"Roddick, Andy ";"Del Potro, Juan Martin ";"Federer, Roger ";"Davydenko, Nikolay ";"Verdasco, Fernando ";"Gonzalez, Fernando ";"Wawrinka, Stanislas ";"Gonzalez, Fernando ";"Blake, James ";"Nalbandian, David ";"Robredo, Tommy ";"Wawrinka, Stanislas ";"Cilic, Marin ";"Stepanek, Radek ";"Almagro, Nicolas "})>1
becomes
{2;1;1;2;1;1;2;2;1;2;2;2;1;1;1;2;1;1;1}>1
{TRUE;FALSE; FALSE;TRUE; FALSE;FALSE; TRUE;TRUE; FALSE;TRUE; TRUE;TRUE; FALSE;FALSE; FALSE;TRUE; FALSE;FALSE; FALSE}
Step 3 - Multiply arrays
(COUNTIF($H$2:H2,$B$3:$B$21)=0)*(COUNTIF($B$3:$B$21,$B$3:$B$21)>1)
becomes
{TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE; TRUE;TRUE;TRUE;TRUE} * {TRUE;FALSE; FALSE;TRUE; FALSE;FALSE; TRUE;TRUE; FALSE;TRUE; TRUE;TRUE; FALSE;FALSE; FALSE;TRUE; FALSE;FALSE; FALSE}
and returns
{1;0;0;1;0;0;1;1;0;1;1;1;0;0;0;1;0;0;0}
Step 4 - Divide 1 with array
The LOOKUP function ignores error and if we divide 1 with 0 an error occurs. 1/0 = #DIV/0!
1/((COUNTIF($H$2:H2,$B$3:$B$21)=0)*(COUNTIF($B$3:$B$21,$B$3:$B$21)>1))
becomes
1/{1;0;0;1;0;0;1;1;0;1;1;1;0;0;0;1;0;0;0}
and returns
{1;#DIV/0!;#DIV/0!;1;#DIV/0!;#DIV/0!;1;1;#DIV/0!;1;1;1;#DIV/0!;#DIV/0!;#DIV/0!;1;#DIV/0!;#DIV/0!;#DIV/0!}
Step 5 - Return value based on array
LOOKUP(2,1/((COUNTIF($H$2:H2,$B$3:$B$21)=0)*(COUNTIF($B$3:$B$21,$B$3:$B$21)>1)),$B$3:$B$21)
becomes
LOOKUP(2, 1/{1;0;0;1;0;0;1;1;0;1;1;1;0;0;0;1;0;0;0}, $B$3:$B$21)
becomes
LOOKUP(2, 1/{1;0;0;1;0;0;1;1;0;1;1;1;0;0;0;1;0;0;0}, {"Federer, Roger ";"Djokovic, Novak ";"Murray, Andy ";"Davydenko, Nikolay ";"Roddick, Andy ";"Del Potro, Juan Martin ";"Federer, Roger ";"Davydenko, Nikolay ";"Verdasco, Fernando ";"Gonzalez, Fernando ";"Wawrinka, Stanislas ";"Gonzalez, Fernando ";"Blake, James ";"Nalbandian, David ";"Robredo, Tommy ";"Wawrinka, Stanislas ";"Cilic, Marin ";"Stepanek, Radek ";"Almagro, Nicolas "})
and returns Wawrinka, Stanislas in cell H3.
Step 4 - Return values from List2
When values run out from List1 formula1 returns errors, the IFERROR function then moves to formula2.
IFERROR(formula1, formula2)
formula2 is just like formula1 except that it returns values from List2 and duplicates found between List1 and List2.
Another IFERROR function is used to handle errors from List2, the formula then returns values from List.
IFERROR(IFERROR(formula1, formula2), formula3)
Download Excel *.xlsx file
how-to-extract-a-list-of-duplicates-from-three-columns-in-excelv2.xlsx
Extract a list of duplicates from a column
The array formula in cell C2 extracts duplicate values from column A. Only one duplicate of each value is displayed […]
Filter values that exists in all three columns
This article explains how to extract values that exist in three different columns, they must occur in each of the […]
Find min and max unique and duplicate numerical values
Question: How do I get the largest and smallest unique and duplicate value? The image below shows you a list […]
Filter duplicates within same date, week or month
The image above demonstrates a formula in cell E3 that extracts duplicate items if they are on the same date. […]
Extract duplicate values with exceptions
The formula in cell E2 returns duplicate values from column A but values in column C are excluded from the […]
Label groups of duplicate records
Michael asks: I need to identify the duplicates based on the Columns D:H and put in Column C a small […]
Extract a list of duplicates from two columns combined
The following regular formula extracts duplicates from column B (List1) and column D (List2) combined, the result is shown in […]
Extract a list of alphabetically sorted duplicates from a column
The following array formula extracts duplicate values sorted from A to Z from cell range B3:B21. Excel array formula in […]
Extract a list of alphabetically sorted duplicates based on a condition
The following image shows you a data set in column B and C. The formula in cell E2 extracts a […]
7 Responses to “Extract a list of duplicates from three columns combined”
Leave a Reply
How to comment
How to add a formula to your comment
<code>Insert your formula here.</code>
Convert less than and larger than signs
Use html character entities instead of less than and larger than signs.
< becomes < and > becomes >
How to add VBA code to your comment
[vb 1="vbnet" language=","]
Put your VBA code here.
[/vb]
How to add a picture to your comment:
Upload picture to postimage.org or imgur
Paste image link to your comment.
This is close to what I need. I have three lists of email addresses. If an email address appears in all three (not two out of three) lists then place it in the duplicate column. Also I need all three named ranges to be dynamic. Can you help?
Peter Voss,
See this post: Filter values that exists in all three lists
[...] in Compare, Excel, Search/Lookup on Sep.27, 2012. Email This article to a Friend Peter Voss asks:This is close to what I need. I have three lists of email addresses. If an email address appears in [...]
Hi there,
I am using Excel 2011 on a Mac and keep getting errrors...
Vanessa,
I don´t have a mac, perhaps it is possible to disable error checking rules:
https://www.addictivetips.com/microsoft-office/show-error-on-formula-referring-to-an-empty-cell-in-excel-2010/
I said before that you're a genius
But I want the previous version (office 2003)
I said before that you're a genius
But I want the previous formula (office 2003)