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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.
Keep in mind that Access supports two sets of wildcard characters: ANSI-89 and ANSI-92.
Each of those standards uses a different set of wildcard characters.
Typically, your database is easier to use if you use IS NOT NULL and enter a friendly message in the Validation Text property.
You can use wildcard characters in your validation rules.
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.
To add validation rules to a table, you open the table and use commands on the Fields tab of the ribbon.
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.
This is the same as setting the Required field property to Yes.
However, when you enable the Required property and a user fails to enter a value, Access displays a somewhat unfriendly error message.
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For more information about data types, field sizes, and input masks, see the article Introduction to data types and field properties.