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detect duplicate number in a column

  1. #1
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    detect duplicate number in a column

    I have data in “sequence no” that represent id number data entered to this cell should be unique. How would I know if I have a duplicate entry? Is there a way a program or scripts in excel that would let know I have a duplicate number in a column?

    I have attached the sample file.

    thanks in advance.
    Attached Files Attached Files

  2. #2
    Forum Guru DonkeyOte's Avatar
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    Re: detect duplicate number in a column

    The file uploaded is 2007 format (profile indicates 2003) -- in 2007

    If you wish to format them...
    -- you can format the Dupes using Conditional Formatting (Home section on Ribbon) - Highlight Cells Rules - Duplicate Values (set format accordingly)

    If you wish to delete them...
    -- you have Remove Duplicates option in Data tab on Ribbon

    If you want to populate Column B per your sample

    B2: =REPT("DUPLICATE",COUNTIF(A:A,$A2)>1)
    copied down

  3. #3
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    Thumbs up Re: detect duplicate number in a column

    problem solved thanks !!

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