MIS 310 Lecture Notes - Lecture 2: Associative Entity, Data Modeling, Information Engineering

• School: George Mason University
• Department: Management Information Systems
• Course: MIS 310
• Professor: Joydip

Document Summary

The diagrams in previous slides are called entity-relationship diagrams. The maximum cardinality of the relationship is shown inside the diamond. The minimum cardinality is shown by the oval or hash mark next to the entity. The name of the entity is shown inside the rectangle. The name of the relationship is shown near the diamond. The relationships in the previous slides are called has-a relationships. The term is used because each entity instance has a relationship to a second entity instance: Information engineering (ie) [james martin 1990] uses crow"s feet to show the many sides of a relationship, and it is sometimes called the crow"s foot model. Integrated definition 1, extended 3 (idef1x) is a version of the e-r model that is a national standard: unified modeling language (uml) is a set of structures and techniques for modeling and designing object-oriented programs (oop) and applications.