Describe the three-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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short essay response is completed by choosing one of the three provided options and fulfilling all listed
poolvac wants to estimate the impact on the sales of units sold of varying levels of advertising in the two different
describe the three-schema architecture why do we need mappings between schema levels how do different schema definition
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