Identifying duplicate entries in a list

Posted on 2004-09-03
Medium Priority
Last Modified: 2013-12-18
I have a field on a form which is a list of names, and need to check to see if there are any duplicates. I want to do this using a separate calculated field which will list any entries that appear more than once in the source field.

How do I do this using a formula. My best guess is to use the @Unique function and then compare this to the original list, but I'm not if this is possible.

Help would be appreciated!

Question by:mrt1
LVL 15

Expert Comment

ID: 11974037
Why would you bother to see which are the duplicates ?
Just put in a Translation formula, to get rid of the duplicates :



LVL 46

Expert Comment

by:Sjef Bosman
ID: 11974184
Or, if you really want to know, use
    @If(@Elements(TheField)=@Elements(@Unique(TheField)); @Success; @Failure("..."))
LVL 24

Expert Comment

ID: 11976162
Here is the formula to extract duplicates from a List

num := "0" : "1" : "2" : "3" : "4" : "5" : "6" : "7" : "8" : "9";
idList := @Subset( num*+ num; @Elements(List));
tmp1 := @Unique(@Replace(List; List; idList));
tmp2 := @Trim(@Replace(idList; tmp1; ""));
@Replace(tmp2; idList; List);


Author Comment

ID: 12008206
My 'list' is actually a concatenation of several list fields - that is why I'm looking for duplicates. I need to return the duplicates themselves - not just a boolean value. This calculated field is going to be displayed on the form as a validation warning -so that users are made aware of the duplicates.

Isn't there a more elegant way of doing it that having to hard code a list of numbers ( There isn't an upper limit to the number of entries in the list, so I don't really want to do this).
I could probably do this using Lotus script, but I just thought it would be simpler using a formula.
LVL 24

Accepted Solution

HemanthaKumar earned 800 total points
ID: 12008274
That is what my formula does.. it returns the duplicates...

list of numbers can be expanded upto any value.. right now it give 100 values.. but it can be increased by appending *+ num to the existing one

num*+ num*+ num will give 1000 values, num*+ num*+ num*+ num yields 10000 values

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

For Desktop Techs: How to retain a user's Notes configuration data when swapping out the end user's computer. (Assuming that you are not upgrading to a completely different version of Notes client) All you need to do is: 1) install Notes o…
  In today’s Arena we can’t imagine our lives without Internet as we are highly used to of it. If we consider our life style just for only 2 min we found that face to face communication is swapped by e-communication.  Every Where from Works place to…
Watch the video to know the simple way to remove or recover or reset lost or forgotten passwords of Outlook PST file. With Kernel Outlook Password Recovery tool such operation is very easy to perform. It is a freeware with limitation to use with 500…
Did you know PowerShell can save you time with SaaS platforms? Simply leverage RESTfulAPIs to build your own PowerShell modules. These will kill repetitive tickets and tabs, using the command Invoke-RestMethod. Tune into this webinar to learn how…

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question