Why do we need mappings between schema
Describe the three-schema architecture. Why do we need mappings between schema levels? How do different schema definition languages support this architecture?
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how do the relations tables in sql differ from the relations defined formally in chapter 3 discuss the other
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describe the three-schema architecture why do we need mappings between schema levels how do different schema definition
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discuss the main categories of data models what are the basic differences between the relational model the object model
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