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Detect if a cell is duplicate

  1. #1
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    Excel 2007
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    Detect if a cell is duplicate

    (Sorry, not sure how to describe in a line)

    I have a mass of data in Columns A through T.
    I would like to find duplicates in Column A that only have negative numbers in Column T and highlight them (all duplicates) with Red Cells. (See AndrewLynas below).
    Then I would like to highlight all the single cells in A that have negative numbers in T with Orange Cells
    Then I would like to find duplicates in Column A and if they are a duplicate and also have a negative number in Column T highlight them Blue, providing there is a duplicate with a positive number in Column T.
    All cells In Column T that are positive numbers should be uncoloured.
    At the end of it I am looking to sort the colours, so I can skim off the data for other uses

    Column A Column T
    AlistairWilliams 109
    AlistairWilliams -2
    AlistairWilliams -177

    [COLOR="rgb(255, 140, 0)"]AlonitStefanini -55[/COLOR]
    AlunLethbridge 4
    AlunLethbridge -202
    AlunLethbridge -328
    AlunLethbridge -405
    AlunLethbridge -573

    AndrewBeer 17
    AndrewBeer -102
    AndrewBeer -158
    AndrewBeer -340

    AndrewLycett 54
    AndrewLycett -128
    AndrewLynas -70
    AndrewLynas -224

    AndrewSesemann 50
    AndyBarnard 26
    AndyBradley 41
    AndyEllis -220
    AndyWatkins -358
    AndyWatkins -603


    I hope that's clear! Thanks in advance for all your help, oh and I don't mind if it is multiple steps, but would you please give an explanation of the solution

  2. #2
    Forum Expert darkyam's Avatar
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    Re: Finding a way to detect if a cell is duplicate, and then act if other cell has -

    There are two ways to do this.
    1. You can have a helper column with this formula: =IF(T2>0,"Black",IF(COUNTIF($A$2:$A$23,$A2)>1,IF(SUMPRODUCT(MAX(($T$2:$T$23)*($A$2:$A$23=$A2)))>=1,"Blue","Red"),"Orange")), and then make very simple conditional formatting formulas off the helper column colors, such as =$U2="Orange" and then just hide U.

    2. You can have three conditional formatting formulas. For blue, =AND($T2<0,COUNTIF($A$2:$A$23,$A2)>1,SUMPRODUCT(MAX(($T$2:$T$23)*($A$2:$A$23=$A2)))>=1). For Red, =AND($T2<0,COUNTIF($A$2:$A$23,$A2)>1,SUMPRODUCT(MAX(($T$2:$T$23)*($A$2:$A$23=$A2)))<=0). For Orange, =AND(COUNTIF($A$2:$A$23,$A2)=1,$T2<0)
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  3. #3
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    Thumbs up Re: Detect if a cell is duplicate

    That works great, Thank you

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