stekhn/gist:16584703877ca138e5a8

Created February 17, 2016 08:44

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Generate unique IDs in Excel

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gistfile1.txt

=IF(COUNTIFS($B$1:B3;B3)>1;INDEX($A$1:A2;IFERROR(MATCH(B3;$B$1:B2;0);1));MAX($A$1:A2)+1)

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