Editing Find and remove duplicates (section)

==== Finding Duplicate Rows That Differ in One Column ====
Example function
<pre>
=IF(AND(LEN(A2)>0, COUNTIF(A:A, A2)>=2), 1, 0)
</pre>

This function works by checking each cell in a specified column (in this case, column A). Here's a breakdown of how it operates:

* LEN(A2)>0: This part of the formula checks if the cell is not empty. It prevents empty cells from being flagged as duplicates.
* COUNTIF(A:A, A2)>=2: This checks how many times the value in cell A2 appears in column A. If it appears two or more times, it meets the criteria for being considered a duplicate.
* IF(AND(...), 1, 0): The IF function combined with AND evaluates the conditions mentioned above. If both conditions are true (meaning the cell is not empty and the value appears two or more times), the function returns 1, indicating a duplicate. If not, it returns 0.

References
* [http://www.extendoffice.com/documents/excel/1499-count-duplicate-values-in-column.html How to count duplicate values in a column in Excel?] Using {{kbd | key = COUNTIF(range, criteria)}} {{access | date = 2015-08-25}} or using '''Pivot Tables'''(樞紐分析表)  to find the occurrence of value >= 2