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The relational data model is commercially dominant because it offers a simple and intuitive way to organize data in tables with rows and columns. This model provides a clear structure for storing and retrieving data, making it easier for businesses to manage and query information efficiently. Additionally, relational databases have been around for a long time, which means there is a vast ecosystem of tools, technologies, and expertise available to support this model. The relational data model also ensures data integrity through constraints like primary keys and foreign keys, making it a reliable choice for businesses.
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