Nickname comapre New Users' and alredy saved nicknames in Airtable DB

How do I create the function to see if there is something like the Nickname of New User(in Text field) and others have already saved in Airtable DB?

You can loop through the rows of an Airtable column and compare values or you can use the Airtable API to filterbyformula. It’s complicated but very powerful.

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I want to know/see code block

Does the link I shared here help?