- December 1, 2019
Data Modeling Certification Practice Question #1
Read moreDo you currently have your Data Modeling Certification? Each month I’ll post a question similar to what will appear in the Data Modeling Institute‘s Data Modeling Certification exam. Answer the question below and click the “Ready to see the answer” button below the question to see...
00 - October 1, 2019
Most difficult data modeling questions
Read moreAt Data Modeling Zone Europe, I will be teaching a full day Advanced Data Modeling Challenges Workshop. I always love to end these workshops by asking a few difficult data modeling questions that I have been asked over the last 12 months. For example, at last...
- August 2, 2019
Captivating name for CDM?
Read moreI am heads down on my next book, which is a book on the power of the conceptual data model. The book is written for business managers and business analysts, and I therefore hesitate to use the term “conceptual data model”. Years ago, I’ve called this...
- March 1, 2019
Can an indicator be NULL?
Read moreAn attribute that is defined as an indicator has only two values, such as Active/Inactive, Yes/No, True/False, and On/Off. I was asked during a training class this week if NULL (empty) can also be a value. Can an indicator attribute have three values, such as Active,...
- February 3, 2019
Ambiguity in Definitions
Read moreI review many data models throughout the year using the Data Model Scorecard technique, and over 95% of the entity and attribute definitions reviewed lack precision. There are certain terms in a definition that, if not explained, automatically make the definition imprecise and vague. The terms...