How to add unique id number column for duplicate rows in Excel?
Supposing there are some duplicate data in a column, now you want to add unique ID number for these duplicate rows as below screenshot shown, do you have any good ways to add them? Here, I introduce a formula to help you quickly handle this job in Excel.
Adding unique ID number column for duplicate rows with a formula
To add unique ID number for duplicate data, you can do as these steps:
1. type 1 into the cell which is adjacent to the first data you want to add ID number.
2. Then in the cell below it, type this formula =IF(B1=B2,A1,A1+1), press Enter key to get the first result, drag fill handle down until last data showing up.
In the formula, B1, B2 are the first two cells in the duplicate data column, A1 is the first ID cell.
Adding missing ID number with Kutools for Excel
If you have a list of ID numbers which including some missing numbers as below screenshot shown, you can apply Kutools for Excel’s Find Missing Sequence Number utility to quickly find and add the missing number.
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