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A control can have a different validation rule from the table field to which the control is bound.This is useful if you want the form to be more restrictive than the table.Validation rules can be set in either table design or table datasheet view.
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.
Validation text lets you provide a message to help users who input data that is not valid.
When data is entered, Access checks to see whether the input breaks a validation rule – if so, the input is not accepted, and Access displays a message.
Access provides a number of ways to restrict input: You can use these methods of validating data alone or in combination with each other.
Data types are not optional, and provide the most basic type of data validation.
You can compare values across different fields using a record validation rule.
For example, a record with two date fields might require that values of one field always precede values of the other field (e.g., Start Date is before End Date). Validation on a form You can use the Validation Rule property of a control on a form to specify a criterion that all values input to that control must meet.
Field Validation Rule You can use a field validation rule to specify a criterion that all valid field values must meet.
You should not have to specify the current field as a part of the rule unless you are using the field in a function.
When you define rules for tables, those rules apply when you import data.Tags: Adult Dating, affair dating, sex dating