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preventing duplicate random numbers

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  1. #1
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    preventing duplicate random numbers

    i currently have a formula in a cell that makes a large random number

    =RAND()*(100000-12000000)+12000000
    the random number is use as a order number and is put with other data in a list of orders.

    how to i make an if statement inside a macro which will search down a set of rows to see if there is a duplicate number in order to made sure the same number is not used twice

    thanks for any help

  2. #2
    Forum Expert Domski's Avatar
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    12-14-2009
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    Re: preventing duplicate random numbers

    Hi,

    I put this together a bit ago that might point you in the right direction.

    Hope it helps,

    Dom
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