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Chapter2 資料庫系統概念與架構 (Three-Schema Architecture (:fire::fire::fire:p.20圖)…
Chapter2 資料庫系統概念與架構
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Data Model
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分類
Conceptual (high-level, semantic)
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e.g. ER model, object data model
Physical (low-level, internal)
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Representational (or implementation, record-oriented)
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e.g. relational model, hierarchical model, network model
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