How to set access verification rules

Access validation rules can verify whether user input meets conditions and ensure data accuracy. To set it up, select the fields you want to validate and go to the Validation Rules tab. Enter a validation expression such as NOT IsNull([FieldName]) to check for nulls. Limit the range, such as Between [MinValue] And [MaxValue]. Match pattern, such as Like "[Pattern]". Limit values, such as In ("Value1", "Value2", ...).

Access Validation Rule Setup Guide

What are Access Validation Rules?

Access validation rules are a built-in database feature used to verify that user-entered data meets specific conditions. It helps ensure data accuracy and completeness.

How to set validation rules:

1. Open a Microsoft Access database.
2. Select the table for which you want to set validation rules in the Navigation Pane.
3. In Design View, select the fields you want to validate.

4. In the Validation Rules tab of the Field Properties panel, enter your validation expression.

   • You can create complex expressions in the Expression Builder or enter expressions directly.
5. (Optional) Enter a message in the Validation Text field to display when the user enters data that does not satisfy the validation rules.
6. Click OK to save changes.

Validation rule example:

• Ensure that the field value is not empty: NOT IsNull( [FieldName])
• Limit value range: Between [MinValue] And [MaxValue]
• Match specific patterns: Like "*[Pattern]*"
• Only specific values ​​allowed: In ("Value1", "Value2", ... )

Tip:

• Validation rules can only be applied to text, date, and numeric fields.
• Use square brackets to enclose field names when entering validation expressions.
• Validation rules do not affect existing data, it only applies to newly entered data.
• You can set multiple validation rules for the same field. They will be executed in order.

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