# Defining a matching key with the VSR algorithm

Available in...

* Big Data Platform
* Cloud API Services Platform
* Cloud Big Data Platform
* Cloud Data Fabric
* Cloud Data Management Platform
* Data Fabric
* Data Management Platform
* Data Services Platform
* Qlik Talend Cloud Enterprise Edition
* Qlik Talend Cloud Premium Edition
* Real-Time Big Data Platform

## Procedure

1. From the Matching key menu, click Matching algorithm in the top-right corner and select Simple VSR.
2. In the Matching algorithm section, click ![Add new item](https://help.qlik.com/talend/en-US/studio-user-guide/Resources/images/add.svg).
3. In the Data section, click the Select Matching Key tab and click the name of the columns on which you want to apply the match algorithm.

   Matching keys that have the exact names of the selected input columns are listed in the Matching Key table.

   ![Examples of matching keys and their parameters in the Matching Key section.](https://help.qlik.com/talend/en-US/studio-user-guide/Resources/images/match_analysis4.png)

   To remove a column from this table, right-click it and select Delete or click on its name in the Data table.
4. Select the match algorithms you want to use from the Matching Function column and the null operator from the Handle Null column.

   In this example two match keys are defined, you want to use the Levenshtein and Jaro-Winkler match methods on first names and last names respectively and get the duplicate records.

   If you want to use an external user-defined matching algorithm, select Custom and use the Custom Matcher column to load the Jar file of the user-defined algorithm.