What are the standards for inputting access data validation rules?

Microsoft Access data validation rules allow you to set restrictions to ensure that data meets specific criteria, including data types, ranges, lists, regular expressions, and custom rules. To set up a rule, select the field, select the Data Validation button, and select the input criteria. This helps ensure data accuracy and consistency.

Access Data Validation Rule Input Standards

Data validation rules are restrictions set in Microsoft Access for Ensure data meets certain standards. These rules help ensure data accuracy and consistency.

Input criteria:

Data validation rules can be set for the following input criteria:

• Data type: Restrict data input to specific data types, such as text, numbers, or dates.
• Range: Set the range of allowed input values, such as minimum and maximum values.
• List: Specifies the values ​​that are allowed to be selected from a predefined list.
• Regular Expressions: Use regular expressions to define patterns of allowed values.
• Custom rules: Write custom functions or formulas to validate input.

How to set data validation rules:

1. Select the fields to which you want the rule to apply.
2. Click the "Data Validation" button in the "Fields" tab.
3. In the Data Validation dialog box, select the required input criteria.
4. Enter the desired restrictions.
5. Click "OK" to save the rule.

For example, if you want to limit a field to only numbers, you can follow these steps:

1. Select the field.
2. Click the "Data Validation" button.
3. Select the "Data Type" option.
4. Select "Number" from the "Allow" drop-down list.
5. Click "OK".

After setting up data validation rules, the system will display an error message when users try to enter values ​​that do not meet the standards. This helps prevent incorrect or invalid data from being entered, thereby improving data quality.

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