#### Find and mark duplicates

```If I have two columns with data, how do I compare these two columns to find
all duplicates and put an X on a third colum next to all duplicates?  Thanks.
```
 0
maxtrixx (11)
5/2/2005 6:09:37 PM
excel.misc 78881 articles. 5 followers.

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```=if(a1=b1,"X","")

"maxtrixx" <maxtrixx@discussions.microsoft.com> wrote in message
news:139BC711-FAAC-4CD2-A533-CE49BA77291F@microsoft.com...
> If I have two columns with data, how do I compare these two columns to
> find
> all duplicates and put an X on a third colum next to all duplicates?
> Thanks.

```
 0
nh1 (51)
5/2/2005 6:11:23 PM
```The problem is, I don't know which two cells to compare, I need to know if
any of the 800 items in the first colum exist in the 600 items of the second
column.  It's not a row by row comparison.  Thanks.

"N Harkawat" wrote:

> =if(a1=b1,"X","")
>
> "maxtrixx" <maxtrixx@discussions.microsoft.com> wrote in message
> news:139BC711-FAAC-4CD2-A533-CE49BA77291F@microsoft.com...
> > If I have two columns with data, how do I compare these two columns to
> > find
> > all duplicates and put an X on a third colum next to all duplicates?
> > Thanks.
>
>
>
```
 0
maxtrixx (11)
5/5/2005 12:50:05 PM
```hi ...maxtrixx...
You are correct that answer will not work,  I suggest you
look at Chip Pearson's page on duplicates.
http://www.cpearson.com/excel/duplicat.htm#TaggingDuplicates

But here is the formula, which you can fill down with the fill handle.
C2: =IF(COUNTIF(B:B,A2),"x","")      -- column A has a duplicate
D2: =IF(COUNTIF(A:A,B2),"x","")      -- column B has a duplicate
---
HTH,
David McRitchie, Microsoft MVP - Excel    [site changed  Nov. 2001]
My Excel Pages:  http://www.mvps.org/dmcritchie/excel/excel.htm
Search Page:        http://www.mvps.org/dmcritchie/excel/search.htm

"N Harkawat" <nh@nh.com> wrote in message news:uuviKK0TFHA.3544@TK2MSFTNGP12.phx.gbl...
> =if(a1=b1,"X","")
>
> "maxtrixx" <maxtrixx@discussions.microsoft.com> wrote in message
> news:139BC711-FAAC-4CD2-A533-CE49BA77291F@microsoft.com...
> > If I have two columns with data, how do I compare these two columns to
> > find
> > all duplicates and put an X on a third colum next to all duplicates?
> > Thanks.
>
>

```
 0
dmcritchie (2586)
5/6/2005 1:13:00 AM

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