%0 Journal Article
%T EXTERNAL CLOSURE AND ITS APPLICATION IN RELATIONAL DATABASE<br>外部闭包及其在关系数据库中的应用
%A Wang Yujun
%A Shi Baile
%A Hu Meichen
%A <br>王宇君
%A 施伯乐
%A 胡美琛
%J 软件学报
%D 1996
%I 
%X In this paper,the authors start with the introduction of generalized FD path and external closure.With the application of them,they show that the number of closures are reduced when calculating the nonredundant cover of a given functional dependency set.Then a new 3NF synthesis algorithm is presented.In this algorithm,the calculation of nonredundant cover in 3NF synthesis is reduced from two passes to one.So the total number of closures that to be calculated are significantly reduced.
%K Generalized FD path
%K external closure
%K nonredundant cover
%K 3NF synthesisalgorithm<br>广义FD路
%K 外部闭包
%K 无冗余覆盖
%K 3NF合成算法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=27D4D21F1AF36976D4E59127108F8118&yid=8A15F8B0AA0E5323&vid=DF92D298D3FF1E6E&iid=E158A972A605785F&sid=23104246A5FCFCEF&eid=1E41DF9426604740&journal_id=1000-9825&journal_name=软件学报&referenced_num=0&reference_num=10