What are the three different kinds of various data sources, and how do you explain and define them? Can you explain the difficulties associated with dealing with data that has a high valence?

Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter1: Database Systems
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What are the three different kinds of various data sources, and how do you explain and define them? Can you explain the difficulties associated with dealing with data that has a high valence?

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