Uniqueness validation is very important for any database software. We've added no duplicates validation on Forms menu. This way you can avoid same information in one column
No Duplicates option allows you to validate data uniqueness. Please, see below a simple example of how to use this validation option.
1) Create a project with form.
2) Add just one field to the new form with a Single line type.
3) Open the field editing page.
4) Find Validation tab on nd click on it. Check data uniqueness in the column and click Update button. See screenshot below:
You can enter the error message.