Author(s): WANG Li-li, FANG Xian-wen, FANG Huan, Faculty of Science at Anhui University of Science and Technology
Pages: 91-93
Year: 2016 Issue:  5
Journal: Journal of Jilin Teachers Institute of Engineering and Technology
Keyword:  Database; Relational Function; Stepping; Operation of Division;
Abstract: Relational function has always been an important part in the teaching of the introduction to database,and a difficult section for students. The paper hereinafter proposed a method to write out a relational function expression,which is fairly easy to understand with clear-cut layers because it exemplified the practice in detail. It will aid students to understand the operational procedures,and help them grasp the knowledge more accurately as a result.