A validation rule limits or controls what users can enter in a table field or a control (such as a text box) on a form.When you have several people entering data in your database, you can define how users must enter data in specific fields to help maintain consistency and to make your database easier to manage.
-what is the 'like' and 'or' feature in Validation
You can use keyword operators such as "between," "like" and "not"
to restrict types of data.
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