Using Array Formulas in Excel – Find if a list has duplicate items

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Find a list is unique or not using array formulas in excelToday I have learned this very cool way to find if a list has duplicate items or not.

This technique uses array formulas (do not shudder, believe me they are not as difficult as you may think)

First the formula

Assuming your list is in the range, C3: C9, the array formula to find if a list has duplicate items or not is,

=IF(MAX(COUNTIF(C$3:C$9;C3:C9))>1,"list is not unique","list is unique")

Now the explanation

How do you know if a list has no duplicates? Simple, we find the number of times each item has appeared in the list and see if any of those counts are more than 1.

Now, take a look at the formula. It says find the maximum of individual item counts using countif (learn excel countif function) and if the maximum is more than 1, then the list has duplicates, otherwise it is unique.

But…

Yes, entering the formula will not work by itself. You have to make it array formula.

How do you do that?

Oh, that is simple, you just take the excel spreadsheet and whack it until it turns blue.

well, not really. all you need to do is enter the formula and press CTRL + SHIFT ENTER instead of just pressing enter.

that way excel converts your formula to array formula and the COUNTIF(C$3:C$9,C3:C9) will return an array of counts instead of one value. Now you can also guess why we have absolute reference for one parameter of countif () and relative reference for another. Learn more about Absolute and Relative References in excel formulas.

More on Finding and Removing Duplicate Items

> Using pivot tables to get unique items in excel
> Getting unique items using data filter and formulas
> Use advanced data filters to find unique items
> Eliminate Duplicate Entries in a List using Formulas
> Get Unique items using Excel 2007 built in features

This post is part of our Spreadcheats series, a 30 day online excel training program for office goers and spreadsheet users. Join today.

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19 Responses to “Free Invoice Template using Excel – Download”

  1. Doug H says:

    Nice post! Invoicing for the small biz or solo entrepreneur is something I see a lot of interest in. Also there are great templates from http://office.microsoft.com/en-us/templates

  2. Abhay says:

    This is awesome.

    I would need a little more. e.g. say I generate a Inv. # 1 with all the details. Once done I can click a button all the relevant details gets stored in some table. Further, when i generate a new invoice those details gets stored in same table but just below the previous invoice.

    Is their a way to do this?

  3. Hui... says:

    Daily dose of Excel held a competition in 2005 for this same topic
    It obtained 9 solutions which are shown:
    http://dailydoseofexcel.com/archives/2005/10/27/invoice-app-the-results/

  4. parimal says:

    How can i removed Dollar Sign, As want to use this in india.
    Please reply.

  5. parimal says:

    Also if possible then can i use Indian Rupee Sign and how?

  6. Gaurang Mhatre says:

    Hi Chandoo,

    Thanks for sharing this invoice template, Let me tell you this template will definitely help me since I got a process to handle where this invoice piece comes. Just a small doubt, can we store all the invoice details in PRODUCT & SERVICES sheet. So that whenever I select an invoice number from invoice sheet I can take print out and I can share it as well. Can we do that?? Since I will be dealing with this on monthly basis.
    It would be great if you can help me with this.

    Thanks in advance for your help!

    Regards,
    Gaurang Mhatre

  7. shrikant says:

    Hi Chandoo,

    I was thinking learning excel is quite tuff task but your blog proved me wrong. You made it very interesting. Thank you. Also the template you have provided for Invoice is very helpful to us.

  8. AKIN KARAMAN says:

    Thanks thanks thanks.. Very helpful. 🙂

  9. Trevor Gordon says:

    Hi i love the speadsheet but would like to ask how do i get it to add the description into the invoice as well

  10. Anuj says:

    Hi Randy, I tried to download one of your link "https://www.dropbox.com/s/2yvo0o2tgq9quhe/Medical_Massage_and_Salon_Application-Free.xlsm" However, i found the link unavailable. Can you please help me get the new link or can you please send this VBA file on my Email-ID.

  11. Kapil says:

    Hi, is there any chance that this can work with the "Products & Service" sheet outside of the Invoice sheet. I create multiple invoice files for the numerous clients. Updating the product sheet for each of them maybe a task. Hence, I want to create a MASTER FILE from which data can be picked up without having to insert new data in each of the invoice files.
    Possible? Or am I asking for the moon 😉

  12. Kadr Leyn says:

    Thank you so much for tutorial.
    This example can be reviewed for the example of the advanced invoice that made with excel userform :https://youtu.be/Qr-4of-38DI

  13. Trevor Gordon says:

    Good Day
    i love this template may i ask if it could be modified to have the following
    when you lookup a item code in the next column to the right it brings up the description then the quantity, unit cost, discount and then total otherwise i love the template

    Item Code Description Quantity Unit Cost Discount Total

  14. Denise Konopka says:

    When creating an Invoice template in Excel are you able to utilize the auto row height and wrap feature when the cell is a merged cell? I need to have a number of cells merged together to allow for enough space to type in the description of work performed (lets say cells A-D are merged in each row) however it seems that I am unable to utilize the auto format feature. To work around this I have to manually increase the row height after each entry. Is there a better solution for this? Thank you!

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