O'Reilly logo

Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition by Michael J. Hernandez

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Validation Tables

As you define field specific business rules, there will be instances in which a rule imposes a constraint that defines a distinct set of valid values for a given field's range of values. (This obviously affects the field's Range of Values element in its field specification.) This set of values commonly comprises a relatively fixed number of entries, and the values themselves will rarely change. If the number of entries is rather high, however, you might discover that it's going to be slightly difficult for you to implement this rule. For example, you'll probably run out of room very quickly when you attempt to enumerate each of the values within the Range of Values element on the Field Specifications sheet, and implementing ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required