Free no login dirty chat - Validating data in access

Validation text lets you provide a message to help users who input data that is not valid.

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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".

Expressions can also perform mathematical operations. For example, the expression You can add a field validation rule and/or a record validation rule.

This article explains how to use validation rules and validation text in table fields and form controls.

A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form.

It is easy for an end user to make a mistake when they are entering data or even to leave out important details that must be entered, so we need to check this data when it is being entered into the database.

Allowing invalid data to be entered into the database ensures that the database and the data available will become less valuable and harder for the user to use.

Usually, a record validation rule compares the values of two or more fields.

Tip: If you create a form automatically from a table by using one of the Form commands on the ribbon, any validation for fields in the underlying table are inherited by the corresponding controls on the form.

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Even if you didn't set data validation for a field during table design in Microsoft Access, you can still validate data through the form's Validation Rule property.

When you define rules for tables, those rules apply when you import data.

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