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2-数据模型

2-数据模型

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Unformatted text preview: 2 数数数数 数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数 ER 数数数 2.1 数数数数数数数 2.1.1 数数 数数数 model 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 s=πr2 数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 2.1.2 数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数 2.2 数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数 2.2.1 数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数 数数数数数数数数数数数数数数数数 : 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数 : 数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数 2.2.2 数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数 2.2.3 数数数数数 数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数...
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2-数据模型

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