How does the Preview work in DESelect Segment?

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 to conclude, the difference between running preview and run is that preview is a safe place, a step we take for validating the data and the results are not written to your target data extension yet this only happens when you hit the run button also, users who do understand sql sometimes may want to see the query that deselect segment built, to make sure deselect segment built the query they wanted this is now possible in a very easy way when you preview a selection, a link view sql query becomes available on the preview screen when clicking this link, a modal pops up showing the sql query deselect segment built in a nicely formatted way, complete with indentation and colors for easy reading how to stop running preview? during preview you’ll be able to stop the running of the selection, by clicking on the cancel preview button how to view all the records that you can expect? you can click on the link next to “generated x records” 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 note that the moment you hit run button, we delete this temporary data extension in case you would need it, you can just hit the preview button to re generate this in case prio deduplication has been enabled, you can see a link “generated y record” to redirect you to the actual temporary data extension that has been created during this process after the pro deduplication step, and a link “generated x records” before the prio deduplication step next step https //support deselect com/hc/en us/articles/360005240958