數據模型(待填)

原創 shimingliabc 2020-07-04 18:30

概念數據模型

實體-聯繫(ER模型)
擴展ER模型
面向對象模型

邏輯數據模型

關係數據模型
層次數據模型

關係操作

1.選擇操作
2.投影操作
3.集合操作
4.連接操作

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