# 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="https://2294704369-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MP_U5ZCmiamDOXEOOTC%2Fuploads%2FkXhgMk5WNOQoaktQTj9W%2FScreen%20Shot%202023-11-29%20at%203.19.52%20PM.png?alt=media&#x26;token=5e3fbc79-574a-43e1-a894-65cd9eed94e0" 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.