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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 Elementary Key Normal Form ： ウィキペディア英語版 Elementary Key Normal Form Elementary Key Normal Form (EKNF) is a subtle enhancement on 3NF. By definition, EKNF tables are also in third normal form (3NF). This happens when there is more than one unique composite key and they overlap. Such cases can cause redundant information in the overlapping column(s). A table is in Elementary Key Normal Form (EKNF), if and only if, all its elementary functional dependencies begin at whole keys or end at elementary key attributes. For every full nontrivial functional dependency of the form X→Y, either X is a key or Y is (part of) an elementary key. ==Example== 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「Elementary Key Normal Form」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.