# How to identify unique values in the column

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Hello all,

I want to label the unique entries in the column as unique and repeated entries as duplicate by using beast mode.

Attaching screenshot of the expected result table :

Thank you

• Hi @Vandana

You can use some window functions to get the row number `SUM(SUM(1))` and then compare that number to 1 since you're wanting the first instance to be unique and all others to be duplicate. You'll need to talk with your CSM to get the window functions in beast modes enabled if you don't already have it.

```CASE WHEN SUM(SUM(1)) OVER (PARTITION BY `Email`) = 1 THEN 'Unique' ELSE Duplicate END
```
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• ⚪️

Hi @GrantSmith ,

Thank you for the solution, I have requested to get the window functions in beast mode. Unfortunately, it might take sometime :(

Could you please let me know if you have any other solution in mind..

• You could utilize a Magic ETL dataflow and utilize the Rank and Window function to calculate the row number based on your partition and then use a formula tile to conditionally set the value of each record.

```CASE WHEN `Row Number` = 1 THEN 'Unique' ELSE 'Duplicate' END
```

Row Number being the new field you calculated with the Rank & Window tile.

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• ⚪️

Okay, will try this..

Thank you for the quick help, Very much appreciated :)

• ⚪️
edited March 2022

Hi @GrantSmith :

There are null values as well in the column values, Think cause of that it is failing..

I retried by mapping nulls to NA, still no luck..

```CASE WHEN SUM(SUM(1)) OVER (PARTITION BY `Email`) = 1 THEN 'Unique' ELSE 'Duplicate' END
```

Could you please suggest how to tackle same

• ⚪️
• Did you get window functions turned on in your instance?