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Faster way to COUNTIF across multiple columns for datesets over 100,000 rows

  1. #1
    Forum Contributor JP Romano's Avatar
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    Faster way to COUNTIF across multiple columns for datesets over 100,000 rows

    I'm SURE there's a better way to do this - hoping one of you can help point me to the right function, formula or approach.

    I have spreadsheets being loaded with data by automated process on a daily basis. That data can be anywhere from 5 to over 1 million rows. Generally, we expect about 50,000 rows though.

    Among other validations being done, I need to be sure that there are no duplicates across 4 specific columns. However, I cannot DELETE them - I have to flag them with an error message.

    Currently, I'm doing this by creating a key like FIELD1.FIELD2.FIELD3.FIELD4 for each row.
    I then do a COUNTIF through the range of data on that value, and if the result is > 1, I replace with an error message.

    The calculation is taking far too long though.
    - I have turned off screen updating
    - I have modified calculation to be done manually

    Is there something I can do instead of using COUNTIF, as that processing seems to be killing the performance? Takes just north of 1 minute for 60,000 rows.

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    Thanks for any guidance!

  2. #2
    Forum Guru TMS's Avatar
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    Re: Faster way to COUNTIF across multiple columns for datesets over 100,000 rows

    Suggest you post a sample workbook with some sample data.

    Regards, TMS
    Trevor Shuttleworth - Excel Aid

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