%0 Journal Article
%T 广义投影和外连接
%A 严哲南 楼荣生？
%J 计算机科学
%D 1999
%X inthispaperweintroducemainlytherelationbetweengeneralprojectionandouterjoinandtherelationbetweengeneralprojectionandsemijoin.wealsoputforwardpseudodistributivelawofgeneralprojection.thenweprovideamorematuretheoryabout
%K 数据仓库聚合查询广义投影外连接
%U http://www.jsjkx.com/jsjkx/ch/reader/view_abstract.aspx?file_no=11298681&flag=1