詞語：BCNF
BCNF的意思
BCNF Boyce-Codd Normal Form;鮑依斯-科得範式;修正的第三範式;Boyce-Codd normal form;
BCNF的參考例句
1.The article discussed the applications of the closure algorithm to solve the problem of the functional dependency projection, and the relation decomposition based on BCNF. 文中討論了閉包算法在函數依賴投影求解以及基於BCNF的關係分解中的應用。
2.The necessary condition of decomposition for relational scheme under null value circumstances into BCNF without loss joins, which was presented in Ref. [1], is proved to be wrong. 對文獻〔1〕提出的空值環境下關係模式無損連接分解為（N）BCNF的必要條件，給出二個反例，證明它是不正確的；
3.The mistake in the proving process of the problem of deciding BCNF in reference[1] is pointed out, and a polynomial time algorithm to decide whether a relation schema is in BCNF is given. 文中指出了文獻〔1〕中對BCNF 判定問題證明過程的錯誤之處，通過分析屬於BCNF的關係模式的結構特點，給出了一個判定關係模式是否屬於BCNF的多項式時間算法。