How can i only view new inquiries

Hey, 

I have quite a few forms that generate new inquiries. To my knowledge, the only way to collect the new names in these forms is to copy all of the names in the form and paste them into our database which will remove the duplicates. Unfortunately, there are around 20000 total names and only about 1000 may be new. Is there a way to filter out the names that have already been collected so that i may only collect the new names? Trying to save myself a considerable amount of time by doing this. 

Thanks for your help!

You can download all your submissions as an Excel file.

Help article: How to Download Form Submissions as Excel/CSV/PDF

After that, you can use Excel Filters to Filter for Unique values only.

https://support.office.com/en-us/article/filter-for-unique-values-or-remove-duplicate-values-ccf664b0-81d6-449b-bbe1-8daaec1e83c2#bmfilter_for_unique_values