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Check out this video for a quick data validation overview.
You can download an example workbook with all of the data validation examples you'll find in this article.
Your validation rules can contain expressions — functions that return a single value.
You can use an expression to perform calculations, manipulate characters, or test data. For example, an expression can check for one of a series of values, such as "Tokyo" Or "Moscow" Or "Paris" Or "Helsinki".
The steps in the section Add a validation rule to a table explain how to add validation rules to table fields.
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.
The Validation Rule control property works like a field validation rule.
You should not have to specify the current field as a part of the rule unless you are using the field in a function.