# Union

## What does it do?

Union allows you to combine multiple datasets and models into one by matching the columns.

## How to use it ?

On any previously steps available in your editor select a step and click on **Combine -> Union**

<figure><img src="https://34758050-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MC1g4I2_CgXd0qAq1P7%2Fuploads%2FTHf2mQoZw3tn3X2KIwZb%2FScreen%20Cast%202022-09-29%20at%2010.18.52%20AM.gif?alt=media&#x26;token=cbbd7a49-8ed9-4b63-8fbc-eae35898bafb" alt=""><figcaption></figcaption></figure>

## How to configure it ?

<figure><img src="https://34758050-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MC1g4I2_CgXd0qAq1P7%2Fuploads%2FHj1aoCffQUPrbQDFMILi%2Fimage.png?alt=media&#x26;token=a4fdd830-44a6-4092-ab3e-c19dec6bb7c2" alt=""><figcaption></figcaption></figure>

#### Union

In the form, start by selecting the dataset or models with want to union. If you see an empty list, drop a dataset or a model from the left panel into the canvas.

#### Columns

Select the columns your union step will output.

{% hint style="info" %}
Only the columns that have the same name and type in the two steps will be available&#x20;
{% endhint %}