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データベースとは?

データベースとはデータの効率的な格納、取得、更新を可能とする仕組みです

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現在(2018年) ではリレーショナル型が主流です。

 

 

リレーショナル型とは?

リレーショナル型とはデータを表(列と行をもつ)という概念で格納します

表は1つではなく、役割毎に分割し、複数表にデータを格納します。

表は他表と項目(列)で関連付けをすることにより、表毎の役割分担を可能とします。

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