Use Validation Rules to Minimize Data Entry Errors

Suppose that you want to minimize data entry errors. For example, you want to make sure that the value entered for the unit price of a product is always between 0 and 1000. You can set the Validation Rule property to make sure that all values entered in the Unit Price field fall within this range. If the data you enter does not meet the conditions set by the validation rule, Microsoft Access displays a message.

Open the Products table, click Design View (View menu), and then click the Unit Price field to display its properties.

Want to make sure that a field always contains a value?   In the field’s Required property box, click Yes.

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Want to know more?   Look up Getting Results - Field Properties in Help.