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02-Apr-2019 00:27

For more information about data types, field sizes, and input masks, see the article Introduction to data types and field properties.

You can define validation rules for table fields and for controls on forms.

By default, all .accdb and files use the ANSI-89 standard.

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

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.

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.

Since the Internet is a shared, public resource, security is naturally a very important part of the system.