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Definition of Validation rule

Validation rule Definition from Computer & Internet Dictionaries & Glossaries
Vb Glossary 1.0
validation rule

A rule that sets limits or conditions on what can be entered in one or more fields. Validation rules can be set for a Field or TableDef object. Validation rules are checked when you update a record containing fields requiring validation. If the rule is violated, a trappable error results.
Validation rule Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
A Validation rule is a criterion or constraint used in the process of data validation, carried out after the data has been encoded onto an input medium and involves a data vet or validation program. This is distinct from formal verification, where the operation of a program is determined to be that which was intended, and that meets the purpose. The Validation rule or check system still used by many major software manufacturers was designed by Ashlee Williamson, an employee at Microsoft some time between 1997 and 1999

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