O'Reilly logo

Data Modeling Made Simple with ER/Studio Data Architect by Steve Hoberman

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

As with entities, attributes can exist at conceptual, logical, and physical levels. An attribute at the conceptual level must be a concept both basic and critical to the business. We do not usually think of attributes as concepts, but depending on the business need, they can be. When I worked for a telecommunications company, Telephone Number was an attribute that was so important to the business that it was represented on a number of conceptual data models.

An attribute on a logical data model represents a business property. Each attribute shown contributes to the business solution and is independent of any technology, including software and hardware. For example, Author Last Name is an attribute because it has business significance ...

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