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Is stability an important property for a candidate key on the logical data model?
A candidate key is an attribute (or set of attributes) that identifies an entity. A candidate key is either...
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The fifth of the five killer questions: Omissions
In the free Data Model Scorecard Validation Tool, there are five “killer” questions out of the over 150 questions...
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The fourth of the five killer questions: Time
In the free Data Model Scorecard Validation Tool, there are five “killer” questions out of the over 150 questions...
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The third of the five killer questions: Filter
In the free Data Model Scorecard Validation Tool, there are five “killer” questions out of the over 150 questions...
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The second of the five killer questions: Purpose
In the free Data Model Scorecard Validation Tool, there are five “killer” questions out of the over 150 questions...
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Data Model Size
There is a project manager looking to estimate development and support tasks based on the number of entities on...
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Tips to spot subtypes and supertypes
Adding supertypes and subtypes to your logical data model (LDM) helps improve communication, enforce additional rules, and organize thought....
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Unstructured data classwords
Each attribute on our data model ends in a classword. For example, “Number” is the classword in Account Number,...
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Evolutionary or revolutionary approach to modeling NoSQL?
The symbols we use on our data models were created with relational databases in mind. Luckily, conceptual and...