Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Counting Rows with Duplicate Values

Posted on 2012-04-09
12
354 Views
Last Modified: 2012-04-09
In column A I have last name,  and there are multiple rows that contain the same Last name.

I want the count of last names, but only one to count one occurance of the same name.

How would I do this.  I have Excel 2003.
0
Comment
Question by:seamus9909
  • 4
  • 3
  • 3
  • +2
12 Comments
 
LVL 13

Expert Comment

by:Shanan212
ID: 37824283
You could do this via pivot table.

http://www.techonthenet.com/excel/pivottbls/create.php
0
 

Author Comment

by:seamus9909
ID: 37824313
No that counts each occurance of the last name.
0
 
LVL 13

Expert Comment

by:Shanan212
ID: 37824324
=COUNTIF($A:$A,A1)

Paste anywhere and drag it down
Try that - it will display how many times a same name occurs in column A
0
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

Author Comment

by:seamus9909
ID: 37824339
Ok I am not explaining this correctly.


I want to only count the occurance of the last name once.  So:


Dean
Dean
Dean
Dean
Dean
Smith
Smith



Count of Dean = 1
Count of Smith = 1
0
 
LVL 11

Expert Comment

by:ScriptAddict
ID: 37824342
I would also check out the match function.  It sounds like it would do what you need.

=MATCH(A1,A:A,FALSE)
0
 
LVL 11

Expert Comment

by:ScriptAddict
ID: 37824354
Hmmm perhaps you are trying to get a list/count of unique last names?  Because the count will always equal one based on your recent post.
0
 

Author Comment

by:seamus9909
ID: 37824364
Yes I want to get a list of all the names found.
0
 
LVL 11

Expert Comment

by:ScriptAddict
ID: 37824414
Ok.... use advanced filter.

1)Select column containing last names
2) hold alt and press dfa
3)Click the checkbox for unique records only
4)Look in bottom left hand corner of the Excel window.  You should some something like 9 of 13 records found.

You should see a list of all unique last names, and the number (9) would tell you how many unique last names exist.

-SA
0
 
LVL 46

Expert Comment

by:Martin Liss
ID: 37824457
Display the unique names in column B in a button or macro


Dim colNames As New Collection
Dim RowCount As Long
Dim i As Long

RowCount = ActiveSheet.Range("A:A").End(xlDown).Row - 1

On Error Resume Next
For i = 1 To RowCount
    colNames.Add Range("A" & i).Value, Range("A" & i).Value
Next


For i = 1 To colNames.Count
    Range("B" & i).Value = colNames(i)
Next
0
 
LVL 13

Accepted Solution

by:
Shanan212 earned 500 total points
ID: 37824459
You are saying the same thing here


"No that counts each occurance of the last name."

"I want to only count the occurance of the last name once.  So:

Count of Dean = 1
Count of Smith = 1"

The pivot table option would do that
0
 
LVL 11

Expert Comment

by:ScriptAddict
ID: 37824471
You are absolutely right Shanan212.  And I would likely use a Pivot Table, it's just easier to explain how to use the advanced filter.

And I thought the count might be helpful.
0
 
LVL 42

Expert Comment

by:dlmille
ID: 37824503
To count a given name, you can use the COUNTIF function:

[C2]Dean
[D2]=IF(COUNTIF(A:A,C2)>0,1,0)

To generate names, you can use an array function.

Let's say you have rows 1-18 in column A that have a header and a list of names.  You can put this in cell D2 and drag down for as many rows as you think might have unique names - in this case, only 17 rows need be copied down.

[D2]=INDEX($A$2:$A$18,MATCH(0,COUNTIF($D$2:D2,$A$2:$A$18)))

Its an array function, so you need CTRL+SHIFT+ENTER to confirm.

with error checking:

[D2]=IF(ISNA(INDEX($A$2:$A$18,MATCH(0,COUNTIF($D$1:D1,$A$2:$A$18)))),"",INDEX($A$2:$A$18,MATCH(0,COUNTIF($D$1:D1,$A$2:$A$18))))

CTRL+SHIFT+ENTER to confirm


See attached.

As suggested, the other alternative is to create a pivot table just to list the unique names, and that would give you the list of the unique names.  That's also in the attached.

Dave
getUniqueList-r1.xls
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Workbook link problems after copying tabs to a new workbook? David Miller (dlmille) Intro Have you either copied sheets to a new workbook, and after having saved and opened that workbook, you find that there are links back to the original sou…
This article will guide you to convert a grid from a picture into Excel format using Microsoft OneNote and no other 3rd party application.
This Micro Tutorial will demonstrate in Microsoft Excel how to add style and sexy appeal to horizontal bar charts.
Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…

790 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