There are three schemas and two mapping relations in the structure of database system. i) Write down the three schemas a

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answerhappygod
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There are three schemas and two mapping relations in the structure of database system. i) Write down the three schemas a

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There are three schemas and two mapping relations in the structure of database system.
i) Write down the three schemas and two mapping relations.
ii) Two mapping relations guarantee two independences, please write them separately.
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