Define and state in precise terms the cardinality and participation in Figure 8.

Question

Define and state in precise terms the cardinality and participation in Figure 8.6, the student/course/instructor/building database. Discuss the structural constraints of Figure 8.6. What are the participations, what are the cardinalities, and under which circumstances would the ones depicted be correct or incorrect?

Further Extensions for ER Diagrams with Binary Relationships 205 room number student_name major lives in Student student ID enroll supervisor occupancy book Course Building section number bldg number room number Sq. ft. teach terminal instructor ID oom number office Instructor office hours FIGURE 8.7 ER diagram showing a STUDENT/COURSE/INSTRUCTOR/BUILDING database with room_number added to the relationships where needed.

Explanation / Answer

Here the cardinalities are the rules exisitng in the database and these rules tells how data is stored. Without these cardinalities data in the database would be inconsistent.
And the participation tells the importance of entities and which entity depends on which one and importance of entities.

About cardinalities in the ERD:-

Participation:-

All these cardinalities and participations we use to represent the relationship type and to the dependency on the other entities.

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