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Find duplicate or unique values in a column using Excel formula

Finding duplicate values in Excel can easily be done using Excel Formula.
Manually find duplicate values in a single column with 100 or more rows is tedious and prone to errors.
Thankfully, Excel formula can do this task with precision. Assuming, the data or values has no trailing white spaces.
Trailing white spaces, will cause problem because even though its whitespace still treated as a character by Excel.
Data must be sanitized before comparing.
Excel fomula to find Unique values or duplicates can be done using the formula below.

=IF(COUNTIF($A$1:$A$13,A1)>1, "Duplicate","Unique")

$A$1:$A$13 ==> Range to check duplicate or unique values, adjust the range as required
A1 ==> Check duplicate values at this row or start comparing at A1
>1 ==> If there is a duplicate or a similar value more than 1, if the value is 2. Then the 3rd value that is similar to the other two will be identified as duplicate
"Duplicate","Unique" ==> Label to indicate whether its a duplicate or unique value, change the label as needed
Enter the formula on A1 or in any rows where the checking of duplicate values where start.
After entering the formula on A1, just drag on the bottom right of the cell where a small thick box can be seen until to the last row to compare or check.

Here's a video on how it can be done in action.
Image below shows that ABC1, ABC2 and ABC5 are duplicates while the rest are unique.
The data ABC1, ABC2, etc.. are just sample data it can be replaced with any data that needs to be checked.





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