%0 Journal Article
%T Data Dependencies in Database with Incomplete Information
%A Zhang Yan
%A He Jichao
%J 计算机科学技术学报
%D 1988
%I 
%X To get more meaning of incomplete information,a predicate way is proposed torepresent the nulls.The concepts of functional and multivalued dependencies areextended in the environment which allows nulls in a database relation.The inferencerules which can be applied to the extended dependencies are investigated.Finally it isshown that the rules are complete for the family of extended functional and multivalueddependencies.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=F57FEF5FAEE544283F43708D560ABF1B&aid=3DAEB14CED7E1679ED87D3FE225A66D0&yid=0702FE8EC3581E51&vid=38B194292C032A66&iid=0B39A22176CE99FB&sid=6DE26652A1045643&eid=09E495F616948E78&journal_id=1000-9000&journal_name=计算机科学技术学报&referenced_num=0&reference_num=0