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◀ 2. データベース ▶

本稿はデータベースに関するの記事です。

子記事からデータベース製品を選択してください。

 

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。

仕組みはそれぞれデータベースにより異なり、リレーショナル型、階層型、ネットワーク型と様々あります。

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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