Many to many relationship can be changed into one to many relationship by multilist join in the database, which is the base of query. 5. 在此基础上，通过表连接实现了多对多联系向一对多联系的转换，为构造各种要求的查询提供了条件。
Based on the adjacency multilist, the author gives the algorithms of the graph display and creates a interactive system about the display and query of the graph. 包括：网络图的计算机显示、连通性算法和最短路径算法。
