Cardinality ratios often dictate the detailed design of a database. The cardinality ratio depends on the real-world meaning of the entity types involved and is defined by the specific application. For the following binary relationships, suggest cardinality ratios based on the common-sense meaning of the entity types. Clearly state any assumptions you make. ENTITY 1 1. STUDENT 2. STUDENT 3. CLASSROOM 4. COUNTRY 5. COURSE 6. EMPLOYEE 7. STUDENT 8. CLASS 9. INSTRUCTO R 10. SUBJECT CARDINALITY ENTITY 2 SOCIAL SECURITY_CARD TEACHER WALL CURRENT PRESIDENT TEXTBOOK COMPANY CLASS INSTRUCTOR OFFICE INSTRUCTOR

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.