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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 Boolean conjunctive query ： ウィキペディア英語版 Boolean conjunctive query In the theory of relational databases, a Boolean conjunctive query is a conjunctive query without distinguished predicates, i.e., a query in the form $R\_1(t\_1)\; \backslash wedge\; \backslash cdots\; \backslash wedge\; R\_n(t\_n)$, where each $R\_i$ is a relation symbol and each $t\_i$ is a tuple of variables and constants; the number of elements in $t\_i$ is equal to the arity of $R\_i$. Such a query evaluates to either true or false depending on whether the relations in the database contain the appropriate tuples of values, i.e. the conjunction is valid according to the facts in the database. As an example, if a database schema contains the relation symbols $Father$ (binary, who's the father of whom) and $Employed$ (unary, who is employed), a conjunctive query could be $Father(Mark,\; x)\; \backslash wedge\; Employed(x)$. This query evaluates to true if there exists an individual $x$ who is a child of Mark and employed. In other words, this query expresses the question: "does Mark have employed children?" ==See also== *Logical conjunction *Conjunctive query 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「Boolean conjunctive query」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.