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Compare two columns-delete duplicates from just ONE column

  1. #1
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    Compare two columns-delete duplicates from just ONE column

    Hi,
    I have column A that is 1,500 records.
    I have column B with 40,000 records.

    Among the 40,000 records in column B, duplicates of ALL 1,500 records from column A exist.

    My question is: How do I find WHERE the 1,500 dupes are and how can I delete JUST those records? Please help...THANK YOU in advance!
    Last edited by dawsonsoo; 10-07-2009 at 05:36 PM.

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    Forum Expert Palmetto's Avatar
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    Re: Compare two columns-delete duplicates from just ONE column

    In Column-C use something like this (adjusted for your actual ranges):

    =MATCH(B1,$A$1:$A$3,0)>0

    Note the use absolute references for the column-A.

    Which will return either TRUE or #N/A. Extend the formula down column-C for as many rows as usedin column-B.

    Next, use Advanced Filter with criteria and the option to copy the non-matching entries to another location.

    Make sure column-C has a header say, "Match" (w/o quotes)

    For the AF criteria cell use: ="<>TRUE"
    Palmetto

    Do you know . . . ?

    You can leave feedback and add to the reputation of all who contributed a helpful response to your solution by clicking the star icon located at the left in one of their post in this thread.

  3. #3
    Administrator JBeaucaire's Avatar
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    Re: Compare two columns-delete duplicates from just ONE column

    Assuming A1 and B1 are titles and not data, run this macro...it will use an empty column to delete the column B matches in one big delete command.

    Please Login or Register  to view this content.
    =======
    How to use the macro:

    1. Open up your workbook
    2. Get into VB Editor (Press Alt+F11)
    3. Insert a new module (Insert > Module)
    4. Copy and Paste in your code (given above)
    5. Get out of VBA (Press Alt+Q)
    6. Save your sheet

    The macro is installed and ready to use. Press Alt-F8 and select it from the macro list.



    EDIT: Tip of the hat to Palmetto, this is the same idea just in a macro form.
    Last edited by JBeaucaire; 12-10-2012 at 03:04 PM.

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    Re: Compare two columns-delete duplicates from just ONE column

    Palmetto,
    Worked Beautifully!!!!! I can't thank you enough...
    This bothered me ALL DAY and now I can go on.
    Thank you!

  5. #5
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    Re: Compare two columns-delete duplicates from just ONE column

    Macro works like a charm...thanks a lot.

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    Re: Compare two columns-delete duplicates from just ONE column

    Thank you very much but I have a question:

    This indeed works great using Columns A and B but bombs out when I edit code to use Columns E and F. What am I missing? I'm just changing the A's to E's and the B's to F's.

    Thanks,

    Jim

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    Re: Compare two columns-delete duplicates from just ONE column

    marshajr1,

    Welcome to the Forum, unfortunately:

    Your post does not comply with Rule 2 of our Forum RULES. Don't post a question in the thread of another member -- start your own thread. If you feel it's particularly relevant, provide a link to the other thread. It makes sense to have a new thread for your question because a thread with numerous replies can be off putting & difficult to pick out relevant replies.
    If I have helped, Don't forget to add to my reputation (click on the star below the post)
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    Re: Compare two columns-delete duplicates from just ONE column

    My question is same as marshajr1 and I think its totally relevant to the topic. I had to sort columns A and G replaced B with G in above code but it didn't worked.

  9. #9
    Administrator JBeaucaire's Avatar
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    Re: Compare two columns-delete duplicates from just ONE column

    Yes, I agree. Your question helps clarify the original posted solution and understanding that is important.

    So I will point out that in the post #3 I have highlighted a portion of the "formula" that is being inserted into the cells. That formula us using the R1C1 notation, so instead of writing $A1, we put RC1 which means (relative row - column 1).

    You need to be able to read R1C1 to understand. C2 means Column-2, or column B, C1 means column-1 or column A.

    So change those appropriately to use columns E and F, 5 and 6. Let us know how you get on.

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    Re: Compare two columns-delete duplicates from just ONE column

    Quote Originally Posted by Palmetto View Post
    Next, use Advanced Filter with criteria and the option to copy the non-matching entries to another location.

    Make sure column-C has a header say, "Match" (w/o quotes)

    For the AF criteria cell use: ="<>TRUE"
    Thank you Palmetto for the instructions! I am stuck on the last portion, and have a feeling this is due to me using Excel 2013 (office 365). When I get to the portion of using the Advanced Filter, I have 3 boxes: List Range, Criteria Range and Copy To.
    The List range I am leaving default, which is selected all columns and rows. I copied your text for the Criteria Range: ="<>TRUE" And for Copy To I selected the entire column E, which it put in that field for me Main!$F$1

    When I click OK, I get Reference is not valid. Are there any suggestions for this? I did get all my results of TRUE & #N/A, just trying to get the non-matching results copied over to a new column.

    Thank you!

  11. #11
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    Re: Compare two columns-delete duplicates from just ONE column

    If you want to start an separate thread and attach a sample worksheet, I'll take a look.

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    Re: Compare two columns-delete duplicates from just ONE column

    Quote Originally Posted by JBeaucaire View Post
    Assuming A1 and B1 are titles and not data, run this macro...it will use an empty column to delete the column B matches in one big delete command.

    Please Login or Register  to view this content.
    =======
    How to use the macro:

    1. Open up your workbook
    2. Get into VB Editor (Press Alt+F11)
    3. Insert a new module (Insert > Module)
    4. Copy and Paste in your code (given above)
    5. Get out of VBA (Press Alt+Q)
    6. Save your sheet

    The macro is installed and ready to use. Press Alt-F8 and select it from the macro list.



    EDIT: Tip of the hat to Palmetto, this is the same idea just in a macro form.

    That code worked great for me. Thank you SOO much. I searched for 3.5 hours looking for this code. Nothing else worked.

  13. #13
    Administrator JBeaucaire's Avatar
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    Re: Compare two columns-delete duplicates from just ONE column

    Glad it helped you. A good recommendation for upgrading to a more recent version of Excel falls here, there is a "Remove Duplicates" option built right in now.

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