数据库系统概念(databa system concepts)英文第六版 课后练习题 答案 第8章
C H A P T E R8Relational Databa DesignExercis8.1Suppo that we decompo the schema R=(A,B,C,D,E)into(A,B,C)(A,D,E).Show that this decomposition is a lossless-join decomposition if thefollowing s
时间:2023-05-27 热度:22℃