CHAPTER 5 What are attributes?

Spreadsheets have columnsSimilar to attributesModels all around

This chapter defines the concept of an attribute and the three different levels at which an attribute can exist: conceptual, logical, and physical. Domains and the different types of domains are also discussed.

Attribute Explained

An attribute is an individual piece of information whose values identify, describe, or measure instances of an entity. The attribute Claim Number identifies each claim. The attribute Student Last Name describes the student. The attribute Gross Sales Amount measures the monetary value of a transaction.

Returning to our spreadsheet analogy, the column headings on a spreadsheet are attributes. The cells beneath each column ...

Get Data Modeling Made Simple: A Practical Guide for Business and IT Professionals now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.