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My workplace uses Google Sheets to track invoices across all locations. The two most important columns are next to each other and titled Invoice number and Vendor. I wanted to highlight the Invoice number cell every time there is a duplicate value. I started with =countif(A:A,A1)>1, however, this would highlight any duplicate value, even if the invoices were from two different vendors. Is it possible to format a Google sheet so it will only highlight the duplicate invoice (column F) if and only if columns F and G are both duplicate values?

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    Try COUNTIFS since you want to count the rows with more than one criteria, something like =COUNTIFS(F:F,F1,G:G,G1)>1 should work – cybernetic.nomad Mar 9 '19 at 15:36
  • This looks like it has fixed the problem so far, thank you so much! I had the ">1" inside the parenthesis and this seemed to be the main problem. – Michael Mar 9 '19 at 15:52
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  • custom formula for highlighting duplicates should look like this:

    =COUNTIFS(F:F, F1, G:G, G1)>1

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