Create Distinct ID by Group in Excel without sorting -

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i have excel column cannot sorted , need create unique id group, similar below:

+--------+------+ |  name  | id   | +--------+------+ | jim    |    1 | | sarah  |    1 | | tim    |    1 | | jim    |    2 | | rachel |    1 | | sarah  |    2 | | jim    |    3 | | sarah  |    3 | | rachel |    2 | | tim    |    2 | +--------+------+

you can simple countif() , getting little creative cell references:

=countif($a$1:$a1, a2) + 1

put in b2 (assuming list headers starts in a1) , copy down.

countif() here counting number of times name in adjacent cell has appears in of cells above it. copy down, range grow include cells between a1 , next row up.


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