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No Duplicates option allows you to validate uniqueness of your columns.

Please, see below simple example of how to use this validation option

How to create simple database with validation No Duplicates

1) Create new project Validation Uniqueness 2) Create new form Validation Uniqueness (Enter form name into the field) 3) Add just one field to your new form "ID Number" with Number type Under field you can see link Validation 4) You will see various validation options in the pop-up window. Check No duplicates   5) Then Add record link 6) Now you have first record with "777" 7) If you will try to enter another record with such value you will see Validation Uniqueness in action This field have validation 'No duplicates', so you can add to database only one original record. Hope it helps!