---
title: Run Preview
slug: segment/run-preview
docTags: 
createdAt: 2026-01-16T18:27:33.990Z
---

In the Preview screen, you are able to preview your final Selection before actually running it. Preview will show you the results of your Selection and will calculate the number of records in your results. This allows you to see if the results meet your expectations. If not, you can go back and edit your Selection and run a new preview. 

In **Preview** you can check: 

- if you matched the Data Extensions right
- if your Target Data Extension contains the right columns
- if the right Filters were applied
- if the number of results is as expected
- if the query executes without errors and how Unaric Segment built it.

## View preview SQL

:::hint{type="info"}
This feature is available in **Unaric Segment Enable**, **Plus**, and **Advanced**.
:::

When you preview a Selection, a link **Show SQL Query** becomes available on the **Preview** screen.

::Image[]{src="https://support.deselect.com/hc/article_attachments/29390101144209" size="60" width="2838" height="1484" isUploading="false" darkWidth="2838" darkHeight="1484" showCaption="false"}

When clicking this link, a modal pops up showing the SQL query Unaric Segment built in a nicely formatted way, complete with indentation and colors for easy reading.

::Image[]{src="https://support.deselect.com/hc/article_attachments/4403809524753" size="70" width="1027" height="706" isUploading="false" darkWidth="1027" darkHeight="706" showCaption="false"}

## Stop running Preview

During **Preview**, you’ll be able to stop the running of the Selection, by clicking on the **Cancel Preview** button.

::Image[]{src="https://support.deselect.com/hc/article_attachments/29390096994449" size="80" width="1684" height="1152" isUploading="false" darkWidth="1684" darkHeight="1152" showCaption="false"}

## View all the records that you can expect

Click** See all **to redirect you to the actual Temporary Data Extension that has been created during this process to see the full result for more in-depth validation.

::Image[]{src="https://support.deselect.com/hc/article_attachments/29390096996753" size="80" width="2918" height="1420" isUploading="false" darkWidth="2918" darkHeight="1420" showCaption="false"}

:::hint{type="warning"}
When you run the Selection, this Temporary Data Extension is deleted. In case you would need it again, click the **Run Preview** button to re-generate it.
:::

If Prio Deduplication is enabled, Unaric Segments creates temporary Data Extensions for the data both before and after the deduplication step. You can click the provided links to be redirected to the actual results for each phase.

::Image[]{src="https://support.deselect.com/hc/article_attachments/29390101149969" size="70" width="2908" height="1394" isUploading="false" darkWidth="2908" darkHeight="1394" showCaption="false"}