> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validio.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Duplicate Values

> Identify duplicate entries in a column to maintain data integrity.

## Validator overview

The Duplicate Values validator works similar to the Volume validator configured for the Duplicate Count or Duplicate Percentage metrics.

You can configure volume validators to monitor the following metrics:

| Metric Options | Description |
| :- | :- |
| Duplicate Count | Validates the number of duplicates. |
| Unique Percentage | Validates the percentage of duplicates. |

For more information, see [Volume](https://docs.validio.io/v10.0/docs/validators/validator-types/volume.md) validators. For an overview of all validator types, see [Validator Types](https://docs.validio.io/v10.0/docs/validators/validator-types.md).

### Field selection

For the duplicate value metrics, you have to specify one or several fields. Specifying several fields means field values are concatenated before being counted, which is useful when validating uniqueness of composite keys.

> [!NOTE]
>
> **Null values**: Validio includes `NULL` values in the counts, unless you apply a `NULL filter` to remove them.

## Metric configuration parameters

| Parameters | Description |
| :- | :- |
| Metric | Select the metric to calculate. See the Metric Options table. |
| Field | Select a source field from a list of available fields with numeric data type. |
| Filter | (Optional) Select from a list of filters or create a new filter to specify which records to include. |
| Window | Select from a list of windows or create a new window to specify how to aggregate the data. |
| Segmentation | (Optional) Apply segmentation to analyze data in separate groups. Default is `Unsegmented`. |