Geek Sync | Becoming a Better Data Modeler Part 5: Writing Effective Entity Definitions - Steve Hoberman | IDERA
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Steve Hoberman discusses writing effective entity definitions in data modeling. He notes that definitions need to be clear, complete, and correct. The document provides examples of entity definitions for concepts like "Customer" and "Product". It also includes questions from readers about modeling concepts and terms that could be included on a "Bingo card". Hoberman advises being precise in definitions and checking with the business to validate the accuracy of definitions.
Geek Sync | Becoming a Better Data Modeler Part 5: Writing Effective Entity Definitions - Steve Hoberman | IDERA
- 1. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 1 Becoming a Better Data Modeler Part 5: Writing effective entity definitions February 24, 2021 Steve Hoberman, DMC [email protected] DataModelingInstitute.com SteveHoberman.com Author Sharing Knowledge (ASK) March 22-26 Next Master Class April 12! Definitions need to be Clear, Complete, & Correct 54. Proposal Number is the unique generated proposal number, could be associated with a contract number. Asset Disposal Date is the disposal date of the asset. The Product is a generic entity containing all attributes which are common for each product in the portfolio.
- 2. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 2 Order Line Product Appear on Does Product include Research Items not yet available for sale? Order Line Product Appear on Why am I seeing negative quantities in Order Line Amount? Does Order Line include returns?
- 3. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 3 Order Line Product Appear on Is Product always a finished tangible product ready for sale, or can it include raw materials, packaging items, or even services? Can anybody yell Bingo? B I N G O Customer Product Account Prospect Calendar Visit Contract Department Credit Citizen Site Order Resource Service Employee Agency Consumer Vehicle Case Organization Facility Expense Project Event
- 4. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 4 What terms would go on your Bingo card? B I N G O What is a customer? A Customer is a person or organization who obtains our product for resale. The Customer normally obtains the product through purchase. An example of a customer who does not purchase our product is the Salvation Army, which receives the product for free as a charity organization. A person or organization must have obtained at least one product from us to be considered a Customer. That is, Prospects are not Customers. Also, once a Customer, always a Customer so even Customers that have not obtained anything in 50 years are still considered Customers. The Customer is different than the Consumer, who obtains the product for consumption as opposed to resale. Examples: Walmart Bob’s Grocery Store Military Base 1332 Clear Clear Complete Complete Correct Correct
- 5. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 5 Web resources Be overly precise Let’s see. I’m not sure if Customer includes prospects. Let me add it to the definition and see what the business says.
- 6. DataModelingInstitute.com 2/24/2021 © Steve Hoberman Page 6 Accessible and user-friendly