When we think about Oil Companies, we think mostly about Petrol, Service Stations, and customers, then oil extraction, refining and distribution.
So we end up with this draft list that provides our starting-point for designing the Data Model ...
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Then we think about how the Events in the Product Life-Cycle, how these various things are related, and how they might look on a 3NF Normalised Data Model.
For example, Oil is found by Exploration, extracted, transported, refined to Petrol and finally the Petrol is sold to Customers by Staff in Service Stations.
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