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validation rules are custom build data integrity rules which prevents the user from entering invalid data the field validation rule in access validates the value that you enter in a field access checks data entered in a field when the user navigates to the next field if the input value breaks a validation rule the value is not accepted and access displays an error message field validation rule created on a existing table does not affect the existing records you can test the existing data against the rules to see if it is breaking any rules field validation message is a message displayed when the field input is not valid field validation rule can be created or modified in design view or datasheet view first let us create a field validation rule in design view open the table student in design view validation rule cannot be created on an autonumber field in the field properties window you can enter the validation rule directly or use the expression builder validation rules can contain exp