Formula True-false options relate to a question with two results that constitute each other's opposites. Excel's IF function distinguishes between the two states and establishes what they mean.

For that, you’ll need a formula that returns true when the value is unique and false when the value is a duplicate. To accomplish this, we’ll use the COUNTIF () function in the form: ...

Microsoft Excel comes with a lot of built-in functionality that doesn't restrict you to comparing data in two columns using only one method.

If you want duplicate values to stand out in an Excel spreadsheet, you can choose between two conditional formatting rules.