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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク relational database ： ウィキペディア英語版 relational database A relational database is a digital database whose organization is based on the relational model of data, as proposed by E.F. Codd in 1970.〔 The various software systems used to maintain relational databases are known as relational database management system (RDBMS). Virtually all relational database systems use SQL (Structured Query Language) as the language for querying and maintaining the database. ==Relational model== (詳細はtables (or "relations") of columns and rows, with a unique key identifying each row. Rows are also called records or tuples.〔(【引用サイトリンク】title=A Relational Database Overview )〕 Generally, each table/relation represents one "entity type" (such as customer or product). The rows represent instances of that type of entity (such as "Lee" or "iPhone 6") and the columns representing values attributed to that instance (such as address or price). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「relational database」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.