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A field validation rule checks input to a field, and is applied when the focus leaves the field.A record validation rule checks input to one or more fields is applied when the focus leaves the record.Validation text lets you provide a message to help users who input data that is not valid.When data is entered, Access checks to see whether the input breaks a validation rule – if so, the input is not accepted, and Access displays a message.The steps in the section Add a validation rule to a control on a form, later in this article, explain how to add rules to the properties in individual controls.Your validation rules can contain expressions — functions that return a single value.Access provides a number of ways to restrict input: You can use these methods of validating data alone or in combination with each other.Data types are not optional, and provide the most basic type of data validation.
However, when you enable the Required property and a user fails to enter a value, Access displays a somewhat unfriendly error message.
A control can have a different validation rule from the table field to which the control is bound.
This is useful if you want the form to be more restrictive than the table.
Usually, a record validation rule compares the values of two or more fields.
Tip: If you create a form automatically from a table by using one of the Form commands on the ribbon, any validation for fields in the underlying table are inherited by the corresponding controls on the form.