Special help needed with form building!

Hey everyone, I’m new to Airtable.

I’m looking to create a form for an event. Each customer at the event will be given a unique card ID number. We’d like them to enter in their details (including the ID number) into a form.

How do I create a form whereby if someone enters in ID number 0001, no one else can enter in 0001?

You can’t limit entries to be unique unless you use a linked record field trick, where they choose from a pre-existing list of records that you have already populated in another table, and then the list can get smaller & smaller as people submit records.

A better, easier, simpler option would be to use JotForm, which lets you set a “unique question” which would requires unique answers for a specific field:

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