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Allowing no duplicate entries in a field

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Gary_Nelson
4 - Data Explorer
4 - Data Explorer

Can I code a field so that each new record is unique?

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If you can avoid two records to have the same value in a field, I think you can’t. If you want yo have an unique identifier for every records, you could use a Formula field with RECORD_ID(), or build an code field with an Autonumber field.