Web Reference: You can vet or validate data in Access desktop databases as you enter it by using validation rules. You can use the expression builder to help you format the rule correctly. Basic instructions on how to perform a Format Look Up to satisfy the BTEC Information Systems, Creating Systems to Manage Information (Unit 2) Database Exam in Microsoft Access. Write a Validation Rule so that a user can't enter a value in the UnitsSold column of the WidgetSalesData table that is 0 or less. In the next lesson below, you'll start to query your data in more depth.
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