https://github.com/sebastian-huynh/erwin-data-models

Demonstrating relational integrity between entities through visual modeling.
https://github.com/sebastian-huynh/erwin-data-models

data-model data-science data-structures erwin-data-modeler mapping

Last synced: 9 days ago
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Demonstrating relational integrity between entities through visual modeling.

• Host: GitHub
• URL: https://github.com/sebastian-huynh/erwin-data-models
• Owner: sebastian-huynh
• Created: 2023-10-13T08:19:40.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-12-27T03:46:12.000Z (about 1 year ago)
• Last Synced: 2024-11-07T14:17:46.735Z (2 months ago)
• Topics: data-model, data-science, data-structures, erwin-data-modeler, mapping
• Homepage:
• Size: 3.36 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Data Modeling Using Erwin Software

This was a project I had done for a database design and development class. 


Screenshots of my work are provided according to the requirements. 
 

(_As I am using the academic edition of Erwin, it does not allow for direct source file connection to Github._) 



**Project Instructions:** [View Here](/CIS3050-Project1_Fall_2023.pdf) 


**Project Reflection and Explanation of Functional Dependencies:** [View Here](https://github.com/sebastian-huynh/erwin-data-models/blob/9fb5132bcc191d736eebcc0142521b0424a3f917/EERD%20Functional%20Dependency%20Report.pdf) 


**Erwin Software Info:** [View Here](https://www.erwin.com/products/erwin-data-modeler/) 



![Conceptual Model Image](https://github.com/sebastian-huynh/erwin-data-models/blob/239b3938574ee3e6e945bee849fc88ee2e896283/ERD%20conceptual%20view.png) 


**Conceptual level** of the entity relationship diagram displays the four independent, strong entities (_Department, Supervisor, Employee, and Project_). It also displays the bridging, associative entities between them (_Department_Employee, Supervisor_Employee, and Project_Assignment_) that are required to facilitate the many-to-many cardinalities. There is also the parent-child entity relationship seen between "Project" and "Task". 



![Logical Model Image](https://github.com/sebastian-huynh/erwin-data-models/blob/f51331a09ecd8196e35947fd267548b855da5bef/ERD%20logical%20view.png) 


**Logical level** of the entity relationship diagram expands on the conceptual and shows the attributes of each entity and identifies which function as the primary or foreign keys. 



![Physical Model Image](https://github.com/sebastian-huynh/erwin-data-models/blob/2403286b522ac199cc9beb2ddc75f63cc18113ba/ERD%20physical%20view.png) 


**Physical level** of the entity relationship diagram expands on the logical and shows the formatted datatypes for each attribute compatible with MS Sql Server. 



![Physical EERD Model Image](https://github.com/sebastian-huynh/erwin-data-models/blob/2403286b522ac199cc9beb2ddc75f63cc18113ba/EERD%20data%20model.png) 


**Physical EXTENDED Entity Relationship Diagram Level** extends the original ERD by showing super-subtype entities. In this case, department and employee are the supertypes and the subtypes inherit their attributes and are disjointed (_meaning an instance may not be part of two subtypes simultaneously_).