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Creating Jet Expressions

Chapter 6 uses several functions to validate data entry for most fields in the HRActions table. Chapter 9 uses an expression to select the country and states to be included in a mailing-list query. These examples provide the foundation on which to build more complex expressions that define more precisely the validation rules and query criteria for real-world database applications.

→ To review examples using functions to restrict data-entry values, see “Validating Data Entry,” p. 227.



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