Why Duplicate Entries Ruin Your Data
Want to make sure every email entry in your spreadsheet is unique—without manually checking? Learn how to set up Excel rules that do the work for you.
This video course teaches beginners how to use data validation to ensure that email addresses entered are unique. By using a custom formula based on the COUNTIF function, users can set up rules that only allow unique values within a specific range.
When a user adds or edits a cell value, the formula checks if the input already exists in the named range of emails. If the count is less than 2, the condition is validated and the input is accepted.
Cell references in the formula are relative to the upper-left cell in the selected range.
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