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A record validation rule checks input to one or more fields is applied when the focus leaves the record.

Usually, a record validation rule compares the values of two or more fields.

For example, suppose you apply the following rule to a date field in a table: Forces users to enter values in the field.

This is the same as setting the Required field property to Yes.

To add validation rules to a table, you open the table and use commands on the Fields tab of the ribbon.

To add validation rules to a form, you open the form in Layout view and add rules to the properties of individual controls.

A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form.

By default, all .accdb and files use the ANSI-89 standard.If the table is more restrictive than the form, the rule defined for the table field takes precedence.If the rules are mutually exclusive, they prevent you from entering any data at all.You can use wildcard characters in your validation rules.Keep in mind that Access supports two sets of wildcard characters: ANSI-89 and ANSI-92.

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