## 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*)

### Get 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 […]

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 […]

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

This article demonstrates formulas that extract duplicate values from a column, however, column D contains values that you don't want […]

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 columns 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 to mahmoud-lee

### 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.

**Contact Oscar**

You can contact me through this contact form

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)