---
title: "Set up duplicate check - Basic matching"
slug: "set-up-duplicate-check-basic-matching"
description: "Set up a Basic matching duplicate check to ensure unique records in your table by defining field combinations and activating the check for data quality."
tags: ["Task topic"]
updated: 2026-04-15T12:50:34Z
published: 2026-04-15T12:50:34Z
canonical: "docs.staedean.com/set-up-duplicate-check-basic-matching"
---

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

# Set up duplicate check - Basic matching

Use a basic duplicate check to ensure that no (almost) similar records exist in a table.

To set up a duplicate check rule you can use a duplicate check of type **Basic matching**. If the desired Basic matching duplicate check does not exist, set up a new **Basic matching** duplicate check.

For each **Basic matching** duplicate check, define which combination of table fields is checked on duplicate values. So, the combination of field values must be unique in the table. Only one record can have this combination of field values.

> [!NOTE]
> Note
> 
> A duplicate check can be used in multiple data quality policies. Therefore, changes may impact other data quality policies.
> 
> To review the dependencies and assess the potential effect, first check where the duplicate check is used:
> 
> 1. On the **Duplicate check** page, select a duplicate check.
> 2. On the **Action Pane**, click **Where used**.
> 3. Review the dependencies.
> 
> If the desired changes have an unintended impact on other configurations, you can create a copy of the duplicate check:
> 
> 1. On the **Duplicate check** page, select a duplicate check.
> 2. On the **Action Pane**, click **Copy**.
> 3. On the dialog, enter a new name and click **OK**.
> 4. Make the changes to the copy.

### Steps

1. Click **Data quality management**.
2. Click **Duplicate checks**.
3. Click **New**.
4. In the **Duplicate check name** field, type a value.
5. In the **Duplicate check type** field, select '**Basic matching**'.
6. Define the table that you want to check on duplicate records.

In the **Table name** field, enter or select a value.
7. Sub-task: Select the fields to be checked on duplicate values.
  1. In the **Fields** section, click **Add**.
  2. In the **Available** list, find and select the desired fields.
  3. Click **-> (Add)** to add the fields to the **Selected** list.
  4. Click **OK**.
8. Sub-task: Select the fields that can be merged for a duplicate record.
  1. In the **Merge fields** section, click **Add**.
  2. On the dialog, in the list, find and select the desired fields.
  3. Click **Add (->).**
  4. Click **OK**.
9. Sub-task: Activate the duplicate check.
  1. If the duplicate check setup is finished, you can make it available for selection on the duplicate check rules.

Select **Yes** in the **Active** field.

> [!NOTE]
> Note
> 
> - If active, you cannot edit the duplicate check.
> - If active and used in an active data quality policy version, you cannot make the duplicate check inactive.
10. Close the page.

## Related

- [Set up duplicate check](/set-up-duplicate-check-general.md)