New Perspectives on Computer Concepts 2013: Comprehensive 15th Edition by June Jamrich Parsons,Dan Oja

Exercise 2

You are creating a movie review database, and one field stores the "star rating" that a popular reviewer gave each movie. Movies are rated from one to four stars, so the Stars field is valid only if the number is between 1 and 4. To ensure that nobody enters a value below 1 or above 4, you can use a field rule to filter the data as it's entered into the table.