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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 Rename (relational algebra) ： ウィキペディア英語版 Rename (relational algebra) In relational algebra, a rename is a unary operation written as $\backslash rho\_(R)$ where: * $R$ is a relation * $a$ and $b$ are attribute names * $b$ is an attribute of $R$ The result is identical to $R$ except that the $b$ attribute in all tuples is renamed to $a$. For an example, consider the following invocation of $\backslash rho$ on an $Employee$ relation and the result of that invocation: | |} Formally the semantics of the rename operator is defined as follows: : $\backslash rho\_(R)\; =\; \backslash$ where $t()$ is defined as the tuple $t$ with the $b$ attribute renamed to $a$ so that: : $t()\; =\; \backslash \; \backslash cup\; \backslash$ 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「Rename (relational algebra)」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.