# Anti-merge (unique)

## How to find the difference between datasets

Mito's dataframe difference functionality lets you find unique records across two different dataframes.  You can access this functionality on the `Home` tab, by select the `Merge` dropdown and then selecting `Anti Merge`.

<figure><img src="/files/Hd5hXQG1jdlHJm9zZgz9" alt=""><figcaption><p>Finding unique rows between multiple datasets.</p></figcaption></figure>

* **Unique in Left:** Includes each row from the first sheet that doesn't have a match in the second sheet.
* **Unique in Right:** Includes each row from the second sheet that doesn't have a match in the first sheet.

Just like the other types of merges, Mito uses the merge key that you select for each sheet to detect matches.


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